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I found me a great knapping "hammer" in the scrap box at work. Not PC, HC or even purty but boy howdy is it the perfect fit to the edge of my flints. Held by the copper tube, perpendicular to the lock plate in just a few light pecks the edge looks like a razor! The flats on the brass hex nut are just under an inch in length.
tap tap tap knap knap knap...