VM, have you thought about making up a guide to keep the belt from running off?
Hi Norm, I tried that. It still seems to find a way to jump off. The little plastic jockey pulley is too weak for the task and warps as soon as the belt comes under tension. A mate of mine reckoned he could fix it by putting a cast pulley on it the same size as the plastic one. When I took the mower to him, and he saw the tiny space into which the pulley fits, he was suddenly no longer interested.
