I have drilled several Jigsaw blems. You need to verify the placement of the CG mark first. You will need a competent pro shop to do this.
I purchased 5 Jigsaw blems, and all of the CG's were miss-marked. After finding the correct CG's, you should be able to layout the ball the way that you wish.
Here's a link to finding the correct CG on a miss-marked ball:
http://www.lane1bowling.com/tech/cg.html--------------------
Gary Palma
Owner of X-act Reaction pro shop at Ideal Lanes
www.myideallanes.comRotogrip Star Pro Shop Member
Ebonite International Gold Pro Shop Member
PBA Member