http://wiki.bowlingchat.net/wiki/ima...lled_Balls.pdf
A very good read!  How you drill the ball does 
matter, along with the surface!  Two balls drilled differently with same surface will show huge differences!  I have two pin up balls, same make and model, Deadly Aims,, 
one pin up center, the other kicked out even with ring finger.
pin center same fresh factory surface does a sweet gradual arc to the pocket!
Pin even with ring finger, kicked out, a long arc but hokey stick move to the pocket
Good article link above.
 
			
		
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