ugh, that ball was all roll.
I don't think I was ever once able to get it to clear the heads cleanly, and that was with 3 different drill patterns.
I have a used one around here, probably a mid #15, if I can find it it's yours for $25 + shipping.
That is if you want it, and if I can find it
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I'm neither good, nor consistent, which is why I bowl.