Bob,
I'm not sure what type of pollishing you are going to do, but i'm not sure ceramic would work as a large hole madrel. The heat/cooling properties of clay/ceramic I belive is different than that of glass. You might have problems with shocking. I could be wrong though, it might work. Let us know if it does.
Good luck
__________________
Kari (aka Mythbeliever)
Fire is fun
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, and omg shinny glass beads!
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