Beings balance hole is no longer legal. I don't use them anyway. In laymens terms
1) Ball reaction having a deep thumb hole.
2) Ball reaction of fingers drilled deep
3) Ball reaction if one finger drilled deeper than the other.
I am plugging and moving the thumb hole about 1/4" down/longer span on a ebonite phenom solid symmetrical. No balance hole. 4" p2p, roughly 30 deg val as it is now. pin is 1.5" above and right of ring finger.
thumb, finger hole depth = ball reaction
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thumb, finger hole depth = ball reaction
right, pap 4 1/2 over 1/2 up. AT 10 AR 60, 16.5 mph off hand, around 325 rpm