I have lost the nut that holds the fanbelt pulley on the front of my 2200. It looks from the parts manuals to screw onto the end of the crankshaft. I can slide the pulley on the shaft and it will run for a while but eventually spins itself off. I ordered an M30 nut from Hoye but it did not fit (too large) The diameter seems to be somewhere between 7/8 and one inch on the threads of the shaft. Any help would be greatly appreciated since it is rough trying to mow 5 acres without my tractor. Thanks