are the weights on your 3 balls identical
are they different brands
are they asymetrical or just symetrical cores
are they for heavy/ medium/ or light oiled lanes?
there is alot of different strategys that go into determining
the type version a ball drill needs to be.
I by no means have any knowledge to assist in answering
your question in regarding the drilling of your 3 balls i was
only voicing my opinion in the matter of why they may have
been so differently drilled you need a professional opinion.
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