Same here as Ex, I have drilled 3 of these for myself and have another one on the way, and I have had ZERO problems. Additionally, I have drilled a fair amount for my customers and I have had none come back with any problems like the ones mentioned here.
Drillers who are in a hurry will drill too fast, which heats up the material inside too fast, which can lead to cracking. Make sure the driller takes his/her time, it is worth it in the long run to spend an extra 5-10 minutes than to ruin a ball.
Clint
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Clint Daley-Owner
Lets Go Bowling Daley
Salem, Ohio 44460
TRACK ADVISORY PRO SHOP STAFF