If you are not using a thumb hole drilling options become really tricky. The static weight requirements are different for no thumb hole balls. I cannot remember what they are off the top of my head. You will have to check USBC website for that under static weights. You would be better off putting a thumb hole in it even if you don't use one. Then if the lanes are really hooking, you can put your thumb in the ball and cut the hook down and play straighter.
louie on this site suggested to me to use a high RG low differential ball for lighter patterns (ie. Sonic X, Hot Rod Hybrid) and for more oil something with a high Rg and higher Differential (ie. Power Groove Proactive, Impact Zone). He mainly used a polished (I believe) Granite Gargoyle from Visionary and one of the guys that used his thumb tip had a Hot Rod Hybrid. I can't remember how they were drilled though.
Mike
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Edited on 7/14/2006 2:23 PM