I have a spot on the side of my thumb that rubs
Rubbing on the side of the thumb is a fit problem, depending on which side it is. you would need to adjust the left or right lateral pitch of the hole. Using A thumb slug would really wouldn't make much of difference in the rubbing.
Most use a thumb slug for the feel because they are made from urethane. Also they make it easy to plug and redrill a ball quickly because you don't have to wait for plugging material to set up.
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