I have sold 2 to different folks locally. Was not there at drilling, but just watchuing the people , one was drilled more agressive than the other. Both people throw about the same, but the lady who has one,a 14#er , hers only moves 3-4 boards. The guy, a 15#er, his moves 7-10. Like I say, I'm not sure the drill pattern, but it does show that a LOT depends on the drilling. Hope that helps, if not, sorry to waste your time.
Good Luck !!
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AZ Guy aka: R & L Bowlers Pro
rlbowlerspro@cox.net