I am NOT trying to knock you xxZonexx but if you plan on drilling, as you seem to be with the drill press questions, then I'd suggest you wait a while until you understand how to measure a hand. How to lay out a ball for the desired reaction, given the bowler's style.
I am in no way an expert but it took me over 2 years of learning the reactions of different cores/layouts, hands and thumbs and before you drill up a ball for someone, you may want to read a lot more about hands, fingers, thumbs so you won't mess up a ball.
As I said, I am not knocking you wanting to learn and you'll probably do a very good job, but I'd suggest you learn more before spending a lot of money on equipment.
JMO.
Good Luck !
--------------------
az guy aka: R & L Bowlers Pro
rlbowlerspro@cox.net