You do not have to have a thumb drilled as lond as the weight meets regulations. Also, watch if the guy throwing the ball is flipping the ball and throwing the other way, that is illegal if the weight the second way thown is out of regulations. saying if the pin is high the original layout, the bowler can flip the ball around and now the pin is low, that is illegal. but just check in to it. if he is not flipping the ball then it is all fair game.
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Pro Shop Advisory Ebonite Staff