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If you’re thinning scales on a budget, a cheap block plane (5-10 dollars, used) with a sharp blade, can thin a scale blank quickly, finish with a card scraper if needed.

Make a shooting board with...

You can buy used Dremels, very inexpensively, on EBay or at flea markets. I have bought them for a low as 2 bucks, if you are looking for one to keep in a drill press set up. Do buy a variable speed....