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Champ Body File Sand Paper Sheets - 2 3/4" x 17 1/2" This type of paper is the cats meow for flattening things. (bones, burls, even hones). The paper comes in various grits with an adhesive back and...

I am not much help with dremel. But I have shaped bone with a hacksaw, wood rasp and coarse sandpaper. It is just slow going.

Charlie