the ball 1st drill with label leverage, 1:30 layout (3-4 pin placement), I ask my driller to plug it and redrill it to pin under ring and set it to postive and thumb weight in 1:1 ratio, when i weight the ball in do-do scale with my driller, I find the original CG is shifted a lot, I tried to put the pin under ring and shift the original CG locator toward to PAP at almost 2" and it count as only as 1/4 oz postive, (I think it is because of the plug work on the thumb hole) I have no choice and let him drill with this layout (pin under ring and cg slightly under and 2" to PAP, finally, after drilling, the ball have ending 1/2 oz top, 1/4 oz side weight and 1/8 oz finger weight, I tried to throw it but the ball is flatten out (wash out and not break in the back end, even my spare ball can hook out of this). So I decide to drill my middle finger deep as 3" and hope it can save some more postive side and thumb weight. Problem is slove a little, it move some more (3-5 boards) but very easy to roll-out and transit to massive forward rolling when drive to the pocket. some time the ball flare over the thumb in the middle of the lane, I think I got too much thumb weight this time.
My plan is to drill a balance hole on the NAL to gain back the postive side weight, but I am at doubt that the top weight of my ball is now altered, (may be zero due to I drilled the middle finger hole deep). can anyone help me to suggest where should I put the balance hole and how deep ? I don't want my uranium died like that because of the poor plugged work.
more, is it good to put a balance hole on the NAL ?
My intial track is 1" from both finger and thumb hole with average+ ball speed and revs, and 45 axis rotation.
