It was fun learning about bowling ball cores from my fiance's father. He runs a little pro shop out of his garage. What was more interesting to me was the dual

It was fun learning about bowling ball cores from my fiance's father. He runs a little pro shop out of his garage. What was more interesting to me was the dual angle drilling technique he used, a fair bit of math involved: http://www.bowlersreference.com/Ball/Layout/Dual.htm http://www.bowlersreference.com/Ball/Layout/Dual.htm