Mine is pretty rusted and I think I'am going to replace it. I know its a very hard job due to the fact that power head has to be removed(thats what I'am told). Part is also expensive. i have a line on a good one but it is for a 25" motor. I was wondering if anyone(maybe someone who has or does work in a good machine shop) knows if a machine shop could cut it down and machine the splines and threads on the shaft? the shaft is made that way so you would think it can be done