Stan,
I think that on a modern bowling ball, drilling a hole 180 degrees around the ball would be a bad idea. Flaring weightblocks would cause the ball to flare over/across the hole if placed that far past your val.
Putting the hole there would change the "static" weights, but those don't mean nearly as much with a modern flaring weightblock as they used to with non-flaring weight systems. They still have an influence, but much smaller than before.
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