I've been having quite a few problems with my thumb slugs as of late. It seems that my balls have been drilled very inconsistantly... I can honestly tell which ball I have in hand with my eyes closed. That being said, I talked with my driller and he suggested that we reslug and drill all of my equipment together. He said we can play with pitch angles until we get everything right, and then do all of the balls.

Seeing as how this is most likely going to cost me a pretty penny, I'm very interested in looking at interchangeable thumb slugs. I can only assume that someone makes predrilled slugs. Could anyone give me some information on interchangeable slugs and make some recommendations? Any help would be appreciated!