Hello, made my first pinhole from aluminum pie tin, but I need to thin the material some more. Sanded with 600 wet/dry paper, but have a better idea: using fine grit and a marble, a "concave" surface could be formed... hopefully at it's thinnest near the pinhole. Anyone tried similar method? I'm trying to find a source for the grit (like is used to grind glass) and hopefully don't have to mail order. Any suggestions for where to find this stuff locally?
Received on Tue Mar 26 01:19:27 2002
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