punkrawk77 -- It's not too late, but may or may not be a fairly big job. It depends on how large the original thumb hole was and how much extra has been taken out of it. The insert will require either a 1 1/8" or 1 1/4" round hole. If your driller can simply enlarge the existing hole, it's a simple job. If not, the existing hole will have to be plugged. Why do you want to go to inserts? If you are getting a clean release without squeezing using the thumb hole as is, don't change. Holes in the resin balls do tend to be a little sticky, so if your thumb is hanging that's a good reason to change. But don't do it just because other bowlers are. -- JohnP
