O.K., it's a bit late to come to the party, but here is something I did once.
I took a Granite Gargoyle (yes, I said Granite Gargoyle) and polished it to the hilt. It was a 2-3 pin ball with low topweight. I put the pin about 2 1/2 inches from the pap, below the finger line, with the CG DIRECTLY ON THE PAP, then drilled out the CG, back to 1/2oz sideweight.
Ball was very smooth and very rolly. It also allowed me to do something I hadn't done in ages, play the track area.
I've always regretted getting rid of that ball. One of the most predictable balls I've ever thrown.
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Good transactions list in my profile
ILLEGITIMI, NON-CARBORUNDUM!