A self-piloting rotary broach, built from raw stock on a manual lathe and mill: a locking ring, shank, body, and spindle machined to tight fits and assembled on radial and thrust bearings, holding the hex broach bit slightly off-axis so it self-aligns and cuts a clean hexagonal hole as the workpiece spins — no separate drive needed.
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The hexagonal chip above says it all — clean single-pass cuts, verified with an Allen key.