I have one thats drilled pin under middle finger,cg twoards pap with a wt.hole below pap.this ball is a monster on heavy oil if I play up the boards with up the back release.clean up front,excellent mid lane set up and crushes the pocket.if I slow down a tuch the ball hits too hard and it usually leaves a nine pin.if I come around the side the ball will skate and not set up and when the oil gets thin the ball is to rolly and hits flat.so the big deal is very easy for me to figure out and read.hope this helps.
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I'm not bad,I just bowl that way.