This one is wierd.  I've been using thumb slugs in all my equipment for years.  Bowled a tournament this weekend and kept dropping the ball.  After putting 6 pieces of white tape in (normally NEVER have to use more than 1), I finally noticed my slug was cracked the entire length of the back side.  When I put my thumb in, the carack would expand to about 1/16th of an inch.  

First thoughts was that my driller had too small a hole and the pressure caused the slug to crack.  BUT, that would have tended to push the edges together.

Only thing I can think is maybe the pilot hole was too big but then I can't see any reason for the slug to crack.

Haven't had a chance to get the ball back in the shop yet.

At least now I fully appreciate the importance of a good fitting thumb!

Anyone else ever had a problem like this.  First time anything like this has ever happened, just curious as to the reason.
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~~~SrK - Have balls, will travel

Old bowlers never die, we just don't score as often

Edited on 2/9/2004 9:54 AM