I have had this issue as well, even wearing down cord grips in the right thumb area. An instructor told me it is from the club going off-plane in the transition, and the right thumb tightens against the grip to prevent it from twisting. I don't know if that is correct, but when I don't lay the club off in the transition, which is my main problem, I do not have the wearing down. Also, it only is present on my long clubs, which seems to support this theory.
This is a good question...should there be pressure exerted by the right thumb during the swing that would cause grip wear where it rests or is this a sign of an incorrect motion somewhere during the swing? There has been discussion of a drill that removes this thumb from the grip in order to sense the pressure (lag) in the right forefinger so is this thumb just along for the ride. Any help from the experts?
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