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I don't make it wedge shaped. If needed I adjust the scales near the butt.
I don't use power tools as I said. The file is for shaping the spacer, the 1000 grit only for polising. It really doesn't...

I make mine simply by taking some brass sheet, sawing out what I need and then filing until it fits the scales. Then I simply handsand it with 1000 girt paper to make it smooth.
Dremels work, but...