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@M_V
Mine was jammed mainly because of oil on the aperture blades. I too the lens apart and cleaned the oil off and tightened up the spring and reassembled it, it still stick slightly when focused close and using the auto aperture function but it was a lot better.
Taking the lens apart was pretty simple, just need a couple good precicision screwdrivers. If you want I'll post up a step by step of what I did to take it apart etc in the morning but I did it mainly by trial and error and there's not much to go wrong.