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This is a short vid showing how to make a quick and dirty broaching tool to make square holes.
Drill Square Holes with a Bridgeport or CNCby polygonsolutions
How to Broach a Keywayby omnitasker
Simple tool to drill square holesby arduinoversusevil
Assignment A-Steel Matrix by Joy Fuby jm_ung
Rebuilding Grass Shearsby Phil B
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