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sw20kosh I had the idler pulley go out on me and tried to space the replacement unit Innovate sent me out so that the belt was more centered on it. The next AutoX event I took a very nasty spin and came back into grid to find that it had thrown the belt completely off, but the belt was not damaged. I immediately removed my spacing modification and put a new belt on and did the rest of my runs. I've probably put about 2K miles and a couple of AutoX days on the setup since and have had no belt or idler pulley issues since. FYI I am still using the 75mm pulley and plan to continue to do so.