I'm almost sorry I opened this can of worms, because preferences in
are so personal. Putter designs vary wildly, and you can find a pro
success with any of them. And now I have to do a major rewrite, because
so much has happened in putters in the last 20 years (1997 to 2017) But
I did bring it up, so here are some of the
variants in putter design and what they mean to clubfitting.|
What is the goal?
Most books on putting instruction have these three measures of
the goodness of a putting stroke -- often with others, but
these three seem always to be present.
We have learned a lot about golf science in the past few decades.
Making sense of these lessons, the last of these is the most important
-- perhaps the only really important criterion. Here are the arguments
supporting my assertion:
- Hit the ball on the center of the clubface.
- The clubhead should be traveling on the target line. (Let's
use "target line" to mean the direction we want the putt to start, not
mecessarily the direction of the hole.)
- The clubface should be pointing in the target line.
With all this in mind, let's talk about the characteristics of a modern
putter, and the design features you should consider when fitting a
- The direction the ball takes off is mostly in the direction
of the clubface, slightly influenced by the clubhead path. The golf
community has gotten used to thinking 80:20 as a rule of thumb. But a
putter has almost no loft, so the "obliqueness" of impact is due only
to the clubhead path itself. Given only a few degrees of path error,
the ratio is probably north of 95:05. Put in other terms, a degree of
path error is 20 times less important than a degree of face error. If
you want to practice your stroke, spend a lot more time on where the
face it pointing; the payoff is much greater.
- But what about spin? Won't a path error cause the ball to
hook or slice? In a word... No! Hook/slice is an aerodynamic effect;
the ground just makes the ball roll, and sidespin goes away almost
immediately. Within the first foot or two off the putter face, the ball
is rolling end
over end with a zero-degree axis tilt (talking in TrackMan terms).
There might be a bit of sideways skid before rolling starts,
but the effect is small.
- The problem of an off-center impact is that the clubhead
will twist, sending the putt off-line and perhaps slower. But today's
putters are made with a very high moment of inertia. They resist
twisting much better than the old blade putters. So it takes a much
worse off-center hit to have the same bad effect on the result.
Weight, moment of inertia, and balance
Probably the most interesting facet of putter design and
fitting is the distribution of mass in the club. There are three
"moments" of mass that engineers deal with:
- The mass itself, the "zeroth" moment of mass. This is the
total mass of the club -- what you feel when you just pick it up and
let it hang, or heft it at the balance point.
- The first moment of the mass. This determines where the
balance point is, and balance in a putter is important in all
three dimensions. As a preview to what follows:
The second moment of the mass, the "moment of inertia".
This is most significant for putters in the resistance of the clubhead
to resist twisting at impact.
All three have an effect on the performance of a putter.
- The "balance point" of the whole club is along the axis
of the shaft.
- Heel-toe balance can affect the direction of the clubface.
- Face-back balance affects the stability of face direction
during the stroke.
In 2000, the debate between high-moment heel-toe
and centrally weighted putters was anything but settled. It is now.
What had to happen was for the established pros who used blade putters
lives to graduate to the senior tour or retire. I can't think of a
single competitor on the PGA Tour who uses anything but a high moment
of inertia putter. And you wouldn't recognize today's hi-MOI designs.
At the turn of the century, the way putter head designers moved weight
away from the center of gravity was to make the bottom flange at the
heel and toe much thicker, therefore much heavier, than in the middle
of the blade. Need more MOI? Either add more weight or make the blade
longer so the weight is farther from the center.
The putters of 2017 aren't just heel-toe weighted; designers have all
sorts of ways to move
weight away from the center of gravity, which is how you increase MOI
without increasing weight. The most popular high-MOI designs involve:
Why has this happened? Easy! A high-MOI putter is more forgiving of
non-centered hits. With the old putter designs, a heel or toe hit
twisted the clubhead during impact. The result was a putt both off line
and short. If the head doesn't twist -- and moment of inertia is all
about reisisting twist -- then the putt will roll straight and just as
far as if impact were centered. With my high-MOI semicircular putter
head, I'm not too concerned about whether the ball is centered on the
face at impact; I just focus on face direction, and the putt goes where
I want it to.
- Square-plan heads with a lot of weight at the
corners. A very popular example is the TaylorMade Spider.
designs -- almost like a mallet, but with the semicircle just an
outline of some heavy material (stainless, brass, or tungsten). An
example is the Odyssey Three-Ball putter.
There are different ways to balance putters. The two most common are
Here is a picture of three putters being
tested for balance.
The way to test a putter for balance is to lay the shaft on a flat
surface like a table (or an egg crate, in this case) and see how the
clubhead comes to rest.
Why would you choose one or the other as your putter. It depends at
least in part on your putting stroke. If you putt
straight-back-straight-through, face balanced is probably better for
you. But if you putt on an arc, inside to inside, then toe-down may
the feel you need to make it happen. But the differences are more in
feel than in mechanical performance. Yes, there are measurable
performance differences, but they are subtle rather than compelling.
There is a correlation, but it varies from golfer to golfer; so you
really need to test rather than just choose based on the arc of your
- The Daiwa Pro Balance on the left is hanging
toe-down, so it is balanced toe-down or toe-heavy. This is a
characteristic of traditional blade putters.
- The Odyssey Two-Ball on the right is hanging with its
face pointing skyward. The face is almost perfectly level. This
identifies it as a face-balanced putter.
- The Carbite Polar Balance in the middle is between
the other two in balance as well. It is an Anser-style putter with an
increased moment of inertia due to tungsten inserts in the heel and
toe. (If you read the previous section, you know exactly what this
means and why.) It is as close to a toe-heavy balance you will find in
a modern design.
Jaime Gylan of the Royal Manchester Golf Academy has done a fascinating detailed test of how toe hang affects putting performance. He has shared the results
in a video, which has sharpened my thoughts on this topic. One of the
incidental takeaways of the video -- besides the results themselves --
is the technology available to fit putters in the 2020s. If you want to
do serious putter fitting, you will need some way to actually measure
what the putter is doing. Jaime uses the high end of the technology,
the SAM Putt Lab. At the other end of the cost scale is the iPING app
for smartphones. The phone clips to the putter, and the app uses the
inertial sensors in the phone to determine what the putter is doing.
There is a whole spectrum of instruments in between these two.
There are yet other ways to balance a putter.
One is neutral
balance. (I use that term as an engineer or physicist
balance test shows neutral equilibrium. But putter companies' marketing
departments have invented other terms for it, like "reality
balanced" or "lie angle balanced".) When you use the same balance test
-- rest the
shaft on a table with the head hanging off the end -- the neutral
balance putter will
stay in any position you put it. There is no favored position for it to
hang, like face up or toe down. The point is that the putter will just
rest in your hands, with no tendency for the face to rotate.
This has pluses and minuses. While the
face-balanced putter has no torques rotating the face dynamically during
the stroke, neutral balance even eliminates static torques. The plus is
that even gravity is not going to want to open or shut the face. The
minus is that you lose the tendency of inertia to stabilize the face
position during the swing.
Another is heel-down
This ignores the dynamic forces and focuses on gravity squaring the
putter face statically. In the balance test, the face is perfectly
vertical, so gravity will hold the putter face square. More on this
Let's look at a diagram to better understand the differences in balance
regime for a putter.
The picture above shows four putters viewed from above,
one for each kind of balance we have talked about. The green X is the center of
gravity (CG) of the clubhead. The shaft comes straight down into the
head, and exerts a force on the head -- the red arrow -- during the
transition and forward stroke of the putter. (If the putter shaft were
have a bend in it, or end in a hosel well above the CG of the clubhead,
then the force would act where the axis of the long straight part of
the shaft intersects the plane of the clubhead's CG.)
There's a force we are ignoring: gravity. We can't see the force from
this top view, because gravity always works straight down. But we do know it works through the CG. The picture above
tacitly assumes that the interesting forces on the putter head act
around a vertical axis. But the torques on the hands -- the interesting
torques -- act around the shaft axis, the black centerline in the
diagram to the right. And that axis is not vertical; it is on an angle, the lie angle of the
Here's another diagram, looking at the putter face on.
Here we can see gravity -- the weight
the putter head -- is the light blue vertical force. It can be resolved
into two force components, the darker blue forces. One is "axial",
parallel to the shaft axis, so it can't torque the clubface. The other
is perpendicular to the shaft
axis, so it might well exert a torque that twists the clubhead around
the shaft axis. Note that the perpendicular component always points in
the general direction of the heel; we will see that in the next
diagram. Also note that the perpendicular component is nowhere near the
force of the weight itself. It is a fraction of the weight, that
fraction being the cosine of the lie angle. For a typical putter lie of
74°, the perpendicular component is only 28% of the clubhead's weight.
In the face-on diagram, the force causing forward acceleration of the
putter head (the red force in the previous diagram) is straight at the viewer. It is on the
centerline, the shaft axis, because the shaft is what is causing the
forward acceleration of the head.
Here we have tilted the diagram of the four different
putters, so that now we are looking straight down the shaft. (The shaft is the black circle.) We can
look at all the torques around the shaft axis, the torques the hands on
the grip have to contend with. Remember:
So... Red force operates on green cross, blue force operates on black
circle, to find the torques the hands have to deal with.
- The dynamic torque (due to clubhead acceleration
along the line of the putt) is the red force acting through the CG, the
- The static torque (due to gravity) is the blue force
acting through the shaft, the black circle.
Let's see how each of the balance strategies helps the
golfer, or puts demands on him.
I know of no reliable study comparing face-balanced and
putters. (By "reliable", I mean not
sponsored by a putter manufacturer with skin in the game.) So we don't
yet know which is better: not having to square the putter against
gravity (neutral balance), or having the stroke stabilize face
squareness (face balance). While we're at it, let's add heel-down to
the not-properly-evaluated set; is it OK to make the most of gravity
and ignore the acceleration forces? If I had to
guess, the answer depends on the golfer; I strongly suspect some will
do better face-balanced, others neutral-balanced, and still others with
gravity-balanced. As with so many
things, it's a fitting issue.
- For the toe-down
balanced putter, the force exerted by the shaft is not in
line with the CG of the clubhead. To the degree the line of the force
misses the CG, there will be a torque, the moment
shaft's force. As the shaft pulls the clubhead forward, the torque
tries to pull the face open. So the golfer's hands have to apply a
counter-torque to square the face at impact. But it's worse than that
for most toe-heavy putters. Because of things like shaft offset, the CG
is also behind
the shaft axis. so the blue force is also trying to pull the clubface
open. The hands have to counter both static and dynamic torques opening
Golfers who putt on an arc
have usually developed a feel for applying this torque, because they
have to for the arc stroke. The arc starts with the face open, it
closes to square (ideally) at impact, and continues to close in the
follow-through. The club's applying a torque to the hands satisfies the
feel, provides the resistance the golfer has come to
- For the face-balanced
putter, the red force pulls through
the CG. The CG's reaction force ("every force has an equal and
opposite reaction" - Newton) pulls in exactly the opposite direction.
golfer's force (the red arrow) is in front of the CG and the inertial
force is pulling backwards, it tries to keep
that relationship. If the club were to turn during the transition or
through-stroke, the force would no longer act through the CG; in fact,
it would create a torque tending to bring the clubface back to square.
That is what engineers and physicists call "stable equilibrium"; the
face balance stabilizes the clubface square during the stroke.
nice, but all is not roses. The blue gravitational static force creates
a torque around the shaft axis that wants to pull the face open. The
good news is that this torque is the same throughout the stroke (that's
what "static" means), so the hands can apply a constant torque and that
will keep the face square. No need to adjust the torque during the swing. Indeed, users
of modern face-balanced putters have gotten used to holding against a
static torque, so it is not much of a problem for them.
- For the neutral-balanced
putter, the force is applied
at the CG.
Not in line with it; right through it. So there is no tendency for the
club to turn in your hands, neither due to acceleration nor due to
gravity. But, there is
also no restoring force if, during the stroke, you let the face become
unsquare. If you
do apply any spurious torque during the stroke, the dynamics remain
completely neutral -- which is different
from stable. Instead of being restored to square and
in-line, the face will stay exactly where your hands put it.
- The heel-down
putter, is designed exactly the opposite of the face-balanced putter.
If you recall, the face-balanced putter uses dynamic forces to keep the
face square and doesn't worry about the static forces. The heel-down
putter uses static forces to keep the face square and doesn't worry
about dynamic forces. The blue force works through the shaft, and any
deviation from square is countered by a torque from the blue force to
square the face up again -- the classical definition of stable
equilibrium with the face square.
downside is the dynamic force due to clubhead acceleration; the design
ignored it, but it is still there. And it tends to close the clubface,
a dynamic torque that golfers are unfamiliar with; this putter may take
a little getting used to. But it might work without much adaptation if
the golfer has a pendulum stroke that depends more on gravity than grip
torque. There is little experience yet with this type of balance, so I
can't say much more about it.
the mid-2000s, Steve Boccieri was putting the finishing touches on his
Heavy Putter design.
Charlie Badami, my good friend and a master
clubfitter, was Steve's tour representative, going to professional
tournaments, getting the pros to try it, and fitting them so it
performed optimally for them. Many of the players that tried it did
better with it than their own putter, even though most of those did not
adopt it as their tournament putter for one reason or another. In the
process of fitting some of the best golfers in the world for
learned a lot about where to put weight in a putter, including both the
head and the putter as a whole. For a decade, I kept the things he told
me in confidence. But I've seen almost everything in public by now, so
I don't think there will be any harm in disclosing it. Here's what I
have learned from Charlie and Steve about weight placement in a putter.
heavier putter requires a big-muscle stroke to make it work. That's a
plus. Modern putting instruction teaches that putting should be
accomplished by having the body rock the shoulders, and the arms and
hands should remain quiet. A heavier putter requires it. How
heavier is the Heavy Putter? A typical putter, all up, weighs
about 500 grams. The original Heavy Putter weighs in the vicinity of
900 grams. (The exact amount varies, as we'll see below.)
How heavy should it be? According to Boccieri (in the
video on his web site), heavier
putters for faster greens. The heavier putter requires
you to use only the big muscles, and that is what you need for control
on super-fast greens. The lighter putter allows more hand "pop" to give
more ball speed on slower greens.
But wait! There is an opposing viewpoint on that. Paradigm makes a putter shaft
with weights that can be inserted and secured to vary the MOI of the
putter for different green speeds. And they believe that you want
higher MOI for slower greens -- almost the exact opposite of what
Boccieri recommends. I understand Boccieri's argument; I'm not sure I
understand Paradigm's. But it seems that the world has not reached
agreement on this.
point. According to Charlie, the most
important parameter for putters is the
of the club. His experience has been that every golfer does best with a
balance point 12"-15" up from the ground, measured along the shaft.
This is true with the heaviest Heavy Putter to a comventional-weight
putter. The thing is that almost every putter other than Boccieri's has
a balance point around 8", much closer to the head. Even though
Boccieri's putters have a much heavier head than most putters (475g for
the original Heavy Putter, vs 325g for most Anser-style putters), the
Boccieri putters feel a lot less head-heavy -- and back that up with a
high balance point.
They accomplish that
with a massive counterweight at the butt of the club. No, we're not
talking about the sort of counterweight you might use to backweight a
driver; that is usually 15-25 grams. These are 150-250 grams, ten times
as large. Why should that be? With a full-swing club, wrist hinge is an
essential part of the stroke; indeed, it is the single most important
factor in producing clubhead speed. With a putter, the opposite is
true. The classic putting stroke involves a still left wrist. Even with
a "pop" stroke, it is applied with the hands rather than the dynamic
forces of a full swing.
I would like to speculate here on why
this works. And it does seem to work. Steve says they did extensive
human testing. I have observed and experienced quite a few cases of
anecdotal testing that supports it. So what makes it work? Some of it
is physics, and some must be feel. Consider the three putters in the
diagram at the right. The red arrow is the linear force exerted by the
hands; torque from the hands is not shown. The green cross is the
balance point of the putter, and the dashed arrow is the moment arm of
the force to rotate the putter about its center of gravity (CG is
the same thing as the balance point).
is a conventional putter, with an 8" balance point. This leaves a large
moment arm so, in order to move the clubhead along with the hands, the
hands need to exert considerable torque in addition to the force.
This is completely solved by putter
which zeroes out the hand torque completely. It does so by extending
the shaft well
above the hands, and hanging a big honkin' piece of heavy metal there
-- heavy enough to raise the balance point all the way to the hands.
Now no torque is needed; the hands merely appy force, and the clubhead
follows along. There have been several patents over the years
suggesting this. None of them ever gained traction in the market.
Perhaps it felt too "weird" just having the putter head follow the
hands linearly. I'll get back to this shortly.
represents the happy medium between putters (a) and (b). It has a
large, but hardly huge, counterweight. The counterweight is within the
confines of a
normal putter grip, not extended way above the hands. With the weight
under the grip, it is
impossible to raise the balance point all the way to the hands; i.e.-
enough to zero out the torque. But it does raise the balance point much
closer to the hands. This does two things: it reduces the torque
required (because the moment arm is shorter) at the same time that it
increases the static total weight of the club.
I just lied to
you. Did you catch it? Going from (a) to (c), the torque actually
doesn't change at all. Yes,
the moment arm goes down because the balance point changed. But the
that's on a higher mass, because it is the counterweight that moved the
balance point. If you examine the forces involved, the torque should be
exactly the same if the counterweight is centered under the hands. So
what is the explanation?
will speculate that, while the torque
needed to move the head along is the same as conventional putter (a),
the golfer's feel is fooled by the fact that it seems smaller compared
to the larger total weight the hands are supporting. So the club "feels
light" when it is swung, even though it is heavier than putter (a). I
have felt this repeatedly myself, noting how the putter seems lighter
to swing when it is in fact heavier. Curious whether it is just me, I
tried a test with my
wife, who is very finicky about her putter's feel. I handed her two
asked her to stroke a few putts with each, then tell me which one is
heavier. I made them up to be similar (same grip, shaft, and
length; both Anser-style heads), and in fact the counterweighted putter
had a slightly heavier head. It is also worth mentioning that the heads
and shafts had pretty conventional weights; this was nothing like a
Heavy Putter. When you add it all up, the
counterweighted putter was about 150g heavier, 140g of that in the
counterweight. She consistently picked the heavier, counterweighted
putter as being lighter, and insisted I was lying to her until I
brought out a scale and
weighed the two putters in front of her.
My speculation is that
the golfer putts best and with least effort with a particular ratio of
hand force to hand torque (Force/Torque). More speculation: that ideal
ratio is higher (more force or less torque) than what the typical
putter design does without a counterweight. You need to increase the
mass without increasing the torque, requiring a larger accelerating
force from the hands, to get the
ratio to where it should be. At some point, I'd like to work the math
to see what the force-to-torque ratio has to do with the location of
the balance point.
to clubhead balance.
The original Heavy Putter had large removable weights at heel
toe. They could be selected to be different weights, changing both the
weight of the clubhead and the heel-toe balance. Think of it like a
face-balanced putter, but you can adjust the balance a couple of
degrees either side of exactly face up.
In fitting golfers for
the Heavy Putter, Charlie found that many -- even the Tour Pros -- had
a bias in their misses. Moreover, that bias could be tuned out by
unbalancing the clubhead toward the heel or toe. For him, this became a
fitting fine-tune parameter.
There are other ways fitters can
deal with such a bias. The way I see most often is changing the offset.
But here is another way, if the putter head can do it. Sometimes, in
fact, a particular putter head may be easier to adjust heel-toe
weighting than offset.
|The length of
the putter is dictated mostly by comfort with the putting
At the short end of the scale, consider Michelle Wie's "table
top" stance, or even the ultra-short putter Robert Garrigus used
for a while.
the long end, it doesn't stop with tall golfers who use an upright
putting stance. In spite of the rules against anchoring a long putter
(effectively banning the belly putter), enough golfers continue to use
long putters that they hold away from their sternum instead of against
it. And other golfers use an extra-length putter handle along the
forearm. Matt Kuchar is the poster boy for the style, but I've
experimented with putters like this as early as 2002. My current putter
is a forearm putter with a length of 41".
But there is one rule
of thumb that you disobey at the risk of your putting effectiveness.
combination of length and lie should leave your eyes over the ball at
address. It is accepted as a fact for a long time that you should line
your putt with your eyes over the ball, that you see the alignment best
that way. But you should not be changing your stroke to get your eyes
over the ball;
it is really a
No matter what your most comfortable stance, there is a length and lie
that will put your eyes over the ball. And that is how the
eyes-over-ball should be achieved.
I have heard the advice that,
if you can't have the eyes exactly over the ball, it is better that
they be inside the line than outside it. I'm not sure of the rationale
for this, nor have I verified it myself. Just passing it along as a bit
of conventional wisdom.
information at the start of the discussion, most putter heads you can
buy are built with
between 2° and 5° of loft.
are two factors in choosing a putter loft: the speed of the green you
play, and a particular claracteristic of your putting stroke.
First the greens.
The putt begins with the ball sitting down in whatever height the grass
is on the green. This might be distinctly down on a slow green with
taller grass, or almost on a pool table on a really fast, high-stimp
green. The function of loft is to start the ball at enough of an
upwards angle to get the ball on top of the grass and rolling.
Obviously, this requires more loft for taller grass, and very low loft
for shaved, hard greens.
So what happens if you have too much or
too little loft? Even with a putter, loft produces launch angle and
backspin at the instant the ball leaves the clubface. If there is too
much loft, there will be some period of bouncing instead of rolling
(due to launch angle) and more skidding than necessary before rolling
takes over. If there is too little loft, some of the
happen, but for a different reason; a too-low launch could get kicked
into the air by the grass it is stuffed into, resulting in bouncing.
|Now for your putting stroke.
The discussion so far only recognizes loft at the moment of impact.
If you swing the putter so your shaft is perfectly vertical at impact,
then we've already discussed everything we need to know. But most
people don't putt
like that. Usually, there is some forward shaft lean (sometimes called
"forward press") at impact, and occasionally even backward shaft lean.
Forward press delofts the putter face; if your stroke includes a
forward press, you need more loft than merely that indicated by green
conditions. Conversely, backward lean adds loft at impact. Example: if
you are playing on greens that need a 3° loft
at impact, and you have a 4° forward shaft lean at impact, you will
need a putter with 7° of built-in loft to achieve your 3° impact loft.
I should probably also
mention loft's role in rolling the ball. From time to time I see
advertising saying zero or even negative loft will get the ball rolling
sooner than the conventional lofted putter. It is worth examining this
- If the stroke is level at impact, the
roll-producing effect -- which is real if misleading -- is accompanied
by a failure to lift the ball onto the top of the grass. The result is
bouncing, which is as bad as skidding if not worse. And it is even
worse if the negative loft produces a downward launch angle; that
almost guarantees the ball starts out hopping, even without the effect
- The real answer to get the ball rolling early is the
correct loft for the green and your lean, but with an upward putter
head path. If the upward path is more than the loft, it will produce
some overspin. Not enough to start the ball rolling from the
get-go. Don't kid yourself; it's not close to that. But it will shorten
the time and distance before it's all roll and no skid.
- Now for a note of realism. You might
be able to master the upward-path putting stroke. But consider this. If
the stroke -- even occasionally -- interferes with your putter face aim
or solidity of strike, that loses way more putting effectiveness than a
little more time spent skidding. People selling putter gimmicks always
overemphasize the negatives of skidding. But the consequences of
skidding are relatively minimal, compared to other things that can go
wrong with an unreliable stroke or a poorly fit club.
are more choices for putting grips than for any other club in
bag. Round, flat top, flat sides, paddle, square, pistol, jumbo, and
now even super-jumbo; the Super-Stroke grip is a force in the market
today. The rules even make several exceptions for grips, if the club is
a putter. What works for you is what you should be using. There are no
hard and fast rules, not even good rules of thumb. But here are a few
things to think about as you consider your choice.
- The major
test of a putter grip is if it lets you strike the ball with a square
face. The shape of the grip should be one that allows the hands the
best chance of doing just that. It is likely this is the most
comfortable, relaxed grip to hold, but there is no assurance of that.
fat grip is a double-edged sword. The big radius from the shaft axis to
the hands can cut both ways. On the one hand a 1mm movement of the hand
turns the putter much less with the fat grip than a normal grip. On the
other hand, any hand movement twists the clubhead with a higher torque,
making the clubhead moment of inertia work harder to prevent twisting.
grips are usually heavier than other grips, and sometimes substantially
so. I have used a putter grip weighing almost three times the 52 grams
of a normal grip. That is not necessarily a bad thing, especially if
you counterweight your putter; this will reduce the amount of
counterweight you need to bring up the balance point. Just be sure you
account for it in your design.
I don't know how much there is to choose with a shaft. I
doubt that flex gives a performance or feel difference (though there
may be a sound difference, which contributes to perceived feel). The
reason I say that is we have two facts both working against it:
These add up to: the shaft hardly bends at all. And if it is not
bending, then the flex can't do much for performance nor feel.
- The forces and torques that bend a shaft are an order of
magnitude lower than with full swings.
- At the same time, I measured the stiffness of
representative putter shafts and found them considerably stiffer than
what we have left is weight. There are lightweight graphite putter
shafts, middle weight steel shafts, and I have used a few heavier
shafts, all made of aluminum. Only one is deliberately trying to
provide a heavier weight (the Paradigm,
mentioned above), but it's a fact that the aluminum putter shafts I
have used are heavier than steel or graphite shafts of the same length.
don't see many putters with graphite shafts. The extra weight of steel
or aluminum is consistent with the notion that a good putter has a high
weight and even a high balance point.
The Tech-Line study
Before I leave this subject, I'd like to point those who are
learning more about putting and putters toward a series of articles
that appeared in Golfsmith's
magazine in 1992. The series is "Golf Putters and
Frank Werner and Richard Grieg, a couple of PhD Aeronautical Engineers
founded the Tech-Line company to make putters to their design theories.
Now, 25 years later, the magazine is no longer around nor is the
Tech-Line web site, so I have made a scan of the article available here.
I have listed below some of what they thought were important
putters back then. It is still pretty good advice, though there are
other ways to get some of those important things today.
- Extreme heel-toe weighting, to increase MOI and enlarge
spot. Their putter has a considerably larger measured sweet
of the time. Today there are other places to put the extra weight that
do as much good for MOI; modern designers move the mass back and
around, rather than just out to heel and toe.
- Fairly heavy. All their models are between 320 and 330
grams of head weight, compared with 295 to 320 grams for most putter
heads on the market in the early '90s.
That doesn't sound so heavy today, but they were at the forefront of a
trend that has continued.
- Face-balanced, to prevent any dynamic tendency of the
putter to twist during the swing. Not many face-balanced putters on the
market in 1992.
- A perfectly flat face; milling is the way they
recommend. Their studies showed "face waviness" in popular
putters, sufficient to
cause errors of .5" to 2.5" in a 10-foot putt. Today it's hard to find
a good-quality putter whose face isn't either milled or made of a
carefully manufacture insert.
- A V-sole or single rail on the bottom, to immunize the
putter to lie angle errors. They used a low-friction polyethylene rail
rather than a V-sole, to simultaneously minimize the distance loss due
to a scuff. (Their studies showed that minute, distance-affecting
scuffs were much more common than imagined or felt by golfers, at all
This never caught on.
- A well-designed "aim line". It should be perpendicular to
the face (including the small face loft of the putter), long enough to
be a real aid in aiming the putter (not just an indicator of where the
sweet spot is), and prominent enough to leave a visual "trail" while
The Tech-Line putter never sold well, though that may be more
due to inept
marketing and sales than inherent merit of the product. I've used two
of their models, and each had more years in my bag than any
non-TechLine putter. So they got a lot right.
Ultimately, it's a matter of what the golfer feels comfortable
no universal "right answer" for every golfer, and the variety is
less objective with putter than other clubs.
Last modified Feb 24, 2021