My 1950 3600 has a 14 bolt FF rear on it. I need to rebuild the brakes on it, but I've ran into a snag. I pulled the axle, removed the 2 locking rings with a 6 prong hub socket, adjusted the brakes (star wheel) as loose as it goes, E-brake is off, yet no amount of pulling, yanking, or prying will remove the drum. It won't come off. I thought it would slide right off after removing the locking rings and the thin metal tab ring between them. And yes, the wheel spins freely. It just won't come off. Any insight would be most appreciated!