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Usually the width of the wedge will determine how far the razor will sit in the scales. As for the angle it usually doesn't take much of an angle, just enough so the scales will flex when opening and...

Wood at about 2.5-2.8 mm (.100ish) will be quite flexible and you can use a wedge. I don't like to go any thicker than that for hardwoods. Remember to balance out the razor also. It usually isn't a...