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This is a new & improved, 10-hook mechanical punch card reader. It uses a couple 1/4" diameter springs, 693-bearings, and thin brass rods, as well as tons of M3 nuts/bolts, but is otherwise entirely 3D-printed on my Thing-o-Matic. Turning the crank 'reads' the punch card (the direction does not matter), raising hooks where holes have been punched in the instruction cards.
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