knurl is the raggedy sharp file-like edge on bike pegs and other metal bars for traction. when applied to a piston skirt, it raises the surface, essentially increasing the bore size the piston fits. weve got a machine to do it on auto pistons, what weve got is much too big for a moped piston but i bet theres a knurler out there that would work.
Re: getting a seized metrakit overbored
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