24-09-12, 07:30 PM
if its the thread thats a bit chewed you might be able to get it re threaded with a die to restore the thread,maybe drill a hole to put a split pin on or as some others have done use a circlip etc,welding the nut on is a last resort solution but if you do maybe just get a couple of tack weld on it so removal later is a bit easyer and id change your sprocket (and chain) for new before you weld it!