This is a complex question. The thumb has high and low areas that need to be worked out to make it fit properly. Thumbs are not round in most cases. You want the thumb drilled and worked out so that you do not have to squeeze it to hold on to the ball and you should feel absolutely no pressure on any point of the thumb. Unfortunately this does not happen for many bowlers. Look at the amounts of NuSkin and tapes that are sold every year. A big problem is there are a lot of ball drillers out there that do not know how to work out a thumb and bowlers that do not know either.
Smash49
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