I bet alot of the pros just go with what works for them.. not with what the IBPSIA says is the right way to drill a ball..
Randy did comment how his nails were pressed into the back of the holes or pulling out of the holes.. one of the two.. can't remember
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16-17 mph,350 rpm,PAP 5 1/2 x 3/8up, HighGame 300 x 4, High Series 808
Book Average 205,PBA Xperience ave180