Also, after getting your callous off, recheck your span. I know you think it may be the tape, and that is possible, but I see this problem often. Nine times out of ten,it is caused by years of bowling with an incorrect, too long span. After correcting the span, the bowler is often amazed at how much more comfortable their grip is and how much cleaner their release is. And slowly,sometimes after a couple years or more, the callous diminishes and goes away! It is worth looking into.
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the pooh