Hey guys last night I had two ballsdrilled. When I got home I noticed one wasn't drilled right. I asked for a stacked drill pin over the ring and it got drilled pin over ring with cg in the palm. A label leverage you might say. I am furious but what if anything can I do? I know he'd fix it for free but I am not gonna have a brand new ball that's never been thrown plugged.

My only point to the op is if your upset because you think the cg location effects the roll of the ball you really have no reason to be upset. The cg location does not make the ball stronger or weaker.

If your upset because the driller didn't drill the ball exactly as you asked then that is valid.

Great work Scott and KL. You guys have done exceptional work to show the facts.

Using the dual angle method the first line on a symmetric is through the pin and the cg. Are you guys saying that the placement of the cg does not matter assuming that the drill angle is the same?

Using the dual angle method the first line on a symmetric is through the pin and the cg. Are you guys saying that the placement of the cg does not matter assuming that the drill angle is the same?

Theoretically it makes no difference on a symmetric ball.  The reason is the CG is the heavy spot, and has no dynamic significance.  It is created by the weight block being a little off center in the bowling ball.  From my understanding a ball with a 4" pin has about 1/8" of offset in the weight block.  This makes its movement so minute as far as actual effect.

From a physics standpoint, it matters because a variable is changed...but from a "real" standpoint...it's such a small fraction that a bowler can't tell.  We miss by a few inches shot to shot, if a ball being drilled with the CG in 1/2" different place makes 1/4" difference at the pins....it's not actually any different.  The difference in you shooting 163 and 289 is not 1/4" more or less overall hook.

The cg mark is not 100% accurate by any means and you need to weight the ball yourself to find the actual cg is you're really worried about it!! If you use the DeTerminator to find the psa and you weigh the ball you may find that the cg mark is not accurate. I don't worry so much about dual angle layout for a symmetrical ball, but only worry about the cg for my weight hole placement, if I want to use one!!

OK to answer a couple of questions. Ccrider, the ball was drilled in bham. Regarding what I bowl on. Some very old worn out would lanes that should have been replaced 20 years ago. And yes the main reason I am upset is that the ball was drilled wrong. I realize that worse case scenario this will just be less jumpy on the backend. That said I am more than likely going to sell the ball. Every time I look at it I'm reminded its wrong and I just get upset all over again

Haven't been able to. Been sick with the flu. Did call my driller earlier to let him know what happened.  He didn't know he had drilled it wrong. I figured that much. He said what most of you have been saying that the reaction should still be relatively the same. He said with the pin up drill it should still have a strong backend reaction, especially with my higher Rev rate. We will find out.