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London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
@stevo_com
I suppose you could make one where the hammer and anvil lock so they don't slip past each other and give the "impact". But seeing as that is the reason they exist, I don't think anyone would bother. If you just want a turny thing, you use a drill. If you want a high torque turny thing, you use a drill with a gearbox.