Posted earlier about mower not moving. Here and other places I got the suggestion to replace the belts again as they may have been cheap and already failed. "Old" belt was already frayed on the inside but not obviously stretched. Ordered an official belt and put it on today. Mower now moves but it is making a terrible noise from the rear. Any suggestions? I don't want to put a ton of money into this thing as it is not in the best shape overall.