For last-ditch extraction of broken screws or bolts, you can drill a hole down the middle of the screw, and then tap one of these into the hole. The sharp ridges are spiraled in the opposite direction from normal screw threads, so when you turn it counter-clockwise, the ridges grip and maybe rescue the screw. If not, well, you screwed it in, and now you’ve screwed it up, so basically you’re screwed.
Location: Box 22
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