Dear David,
There are three usual ways to stub the putter, all of which entail a lowering of the putter head below the bottom of the arc established at setup.
First, the upper torso can dip. More specifically, the pivot in the base of the neck can lower in the forward stroke. I think this comes from rear-hand "effort" thru impact ina "hit" stroke (versus a simple dead-hands rocking of the shoulder frame in a "hitless" stroke) or from a deliberate and artificial effort to keep the putter head low to the ground past impact even though the arms are hanging fully extended (not bolt straight, though), thus sticking the putter low down the line. The putter head stays plenty low in a shoulder stroke in which the dead-hands simply stay down there where they naturall hang heavily. But an effort to extend the putter head low and level thru impact and beyond is unhelpful -- the putter head should rise slightly and naturally going thru impact on a mild radiusing. if the stroke were extended all the way into a giant circle over from top of follow-thru over the head all the way to top of backstroke, the circle would be about 9 feet in diameter and nearly 30 feet in circumference. Thru the critical impact zone, the putter head just won't rise much at all, and a ball positioned as much as six inches in front of the putter face at address will still be impacted solidly with plenty of putter face, since the rising of the putter head over this six inches past the bottom of the stroke is well less than half the total height of the putter face, typically about 1/8th of an inch at most (or thereabouts). So don't get handsy and don't try to stick the putter head low and level thru impact -- just swing easily.
Second, the initial setup can have too much "play" in the elbows (too much crook). During the stroke, especially a handsy stroke or one in which the golfer deliberately strives to keep the putter head low going back, the elbow can straighten out, and this lowers the putter head too low coming forward. The third usual way is for the rear knee to yield a little early, clearing the pelvis out from the rear side of the torso, dipping the right shoulder a little coming into impact.
The cure for all of this is to "putt from the top of the body." By this, I mean establish the pivot height and relaxed arm hang at address, and then move the torso and manage the lower body so that the pivot does not dip.
One thing I do to set the pivot-to-green distance in the setup is to tap the putter a little onto the turf and let the grip move a little lower. Then when I breathe in, this raises the chest just a little so the putter sole is suspended onto the tops of the grass blades and not the turf itself. This maneuver creates a very specific distance from pivot to sole of putter that is easily kept stable in the stroke. It also makes starting the stroke with a push-back of the lead shoulder a more natural way to start than with a tug back of the rear hand.
A second thing I do to stabilize the pivot in elevation is to fix the gaze on a blade of grass right in front of the putter sweetspot and get interested in seeing it clearly. This makes my lens shape itself to focus on precisely that distance below my eyes. By keeping my gaze focused on the grass blade, my head and neck stay still as I rock my shoulders. If my head (and eyes) dip, the grass goes out of focus.
Stabilize the top of the body and then have at it without fear of stubbing the putter.
Cheers!
Geoff Mangum
Putting Theorist and Instructor
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