Have 2 Dual 1019's. One is pretty much toast. But has a better idler whell than the one that works. So decided to swap idlers. Darn little threaded screw is froze up. Tried as carefully as I could, still trashed the head. Got the wheel off. Went to the other 1019. Same thing. I sprayed WD-40 and let it sit. Still no luck, it's trying to strip out. Why they didn't use c-clips like later Duals.