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I have cut teeth in feeler-gauges, but they're not the kind of steel that holds a sharp edge for long. Prefer the sandpaper, cause it's new fresh cutting grit with each new piece.
You have to consider that when you make a sandpaper covered gauge, you go by the thickness of the sandpaper x 2 (because it's being looped around a round edge). So, that's usually .014" to .018" just for the paper, then add the appropriate feeler gauge size to make your "file". Then you know why I don't like it below .030" or so, 'cause then you're dealing with feeler-gauges that are thinner/weaker and would probably get messed up with the way I press the sandpaper firmly onto them.
I've been meaning to gently round the sharp end of a razor blade and then add sandpaper around it to see what size "file" that would give me.
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