the newer balls cg position is about 95% spot on.,..with the older balls ,the cg mark could be way off..its not always withing the diamond logo.....check the cg before drilling, so you have it exactly..on lane#1's web site they explain how to do this, but any good ball driller would double check the cg anyway when he is laying out the ball...
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Shake a leg boy, but don't bend the knee!
Rab C Nesbitt