I did some cleaning and painting on the engine and transmission of my 1971 Series 2a and when I put things back together the clutch stopped disengaging. I did pull the lever arm from the shaft that engages and disengages the clutch when cleaning. I'm certain that I had to pull HARD to get out of the hole in the shaft due to rust. Now I cannot disengage the clutch by the lever even if I put an adjustable wrench on it for more leverage. I didn't touch the inside of the clutch at all and I don't want to break the forks by applying too much pressure. Does anyone have an idea of what to try?