cut slot | cut slot

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Cut a width of cardboard to be the top, cut a slot for the mail and then score lines about an inch apart across the entire length on the inside and gently shape into a curve.

To accurately cut a, say, 12 mm wide slot with a 12 mm cutter is not possible; a 10 mm cutter should be used, followed by a 1 mm finishing cut ( ) around the periphery to finish the slot to exactly 12 mm.