Crusher,
YOu sound so confused.
What are you actually looking for?
WHile many balls can potentially be "FORCED" between a Pain and a Black Widow, not many ball balls should be placed there, UNLESS the 3 balls are drilled VERY differently (emphasis on "VERY") or their surfaces are changes significantly.
I strongly suggest the Pain and the BW are decent goto balls, "Partners", as I call them.
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"None are so blind as those who will not see."