Dremel wood carving
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Roughly grind the inside and outside of the edges using the Dremel. I also placed a strip of aluminum tape around the rim of the glass so that my grinding comes out as even as possible. Continue to smooth out the edge using drum sanding attachments: I used 80, 120 and 150 grit. I would have used finer grits but that is all that I could find for the Dremel. After a while, you'll have a fairly smooth edge that although usable, it is still kind of rough. Time to sand by hand using 200