Originally Posted by
noobinsf
Is the other crank arm still there? Can you ride it? I've read that doing so without the nut dislodges the cotter pretty quickly. Haven't done it myself. The one bike for which I removed cotters did so pretty easily with the socket and huge c-clamp trick, but that won't work with a bent cotter, I suspect.
Riding a square taper crank off is a fairly reliable method.
Never had it work on a cotter.