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Start with your 2 pieces of metal and measure out where the holes will go

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Once measured add pilot holes to guide the drill

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Drill the pilot holes all the way through

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Match the second bit of metal in line with the first drill through it then pin them together

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Make the holes larger then get rid of the excess material from the drilled hole

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File the edges into the curved shape you see then rivet the rivets in and the get rid of all sharp edges and you are done