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While we’re on the subject of dastardly dangerous DIY, here’s a piece on how to turn a railroad spike into a rope dart, an ancient Chinese martial arts weapon. This video shows how a rope dart is used by a trained Kung Fu artist. Flailed around by someone who doesn’t know what s/he is doing is obviously a recipe for a knock-out, or worse, so proceed with all sensible caution.

How to Make a Rope Dart from a Rail Road Spike – Link