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I made this with a 1/4 inch piece of steel, a cut off wheel, die grinder, drill, angle grinder and a half round bastard. I used a spare bearing carrier and traced the shape onto a piece of thick paper then I drew the rest of the tool around it, after cutting the shape out of thick paper I carefully scribed the shape onto the steel and used the above tools to finalize the shape, it took a couple of hours lots of patience and a shoe full of metal shavings.