Ive had my permagreen centri for about 3 years an ii'm quite familiar with all the common problems but I can't figure this one out. The drive belt consistantly falls off at random times. Ive tried new belts, tighten the clutch for the idler and played around with the belt guides but it somehow finds a way to work its way off even though the guides appear to not allow it to pop off. Does anyone have this problem or have a solution. I notice that the newer centris have an actual clutch with throttle adjustment. Mine doenst have that. Im wondering how hard it would be to convert it over to that system.