I've got a seized blade clutch on my John Deere GT245 mower. 54 inch deck, 20 hp Kawasaki. It got so hot the blades can't be stopped, had to take the belt deck off. If the engine is started, the clutch get super hot immediately. I've sprayed Kroil (THE best penetrating oil) on it a couple of times. How do I get it off without ruining my crank?