Originally Posted by
Drew Wiley
I mount the lensboard to a much larger wooden board using four perimeter sheet metal screws with metal-cap rubberized washers. This holds the lensboard completely tight without marring it at all. Then the wooden board is what is tightly clamped to the drill press table. This also allows a cleaner cut by the bit entering the board at the end of the cut, rather than pushing the metal through. Not as elegant as a milling machine, but good enough. One does not punch diecast alloys; leave that technique for electrical box knockouts.
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