Help please. I have a hasselblad SWC/M that sometimes jams after the exposure. The shutter fires normally but then the wind knob is locked. If I remove the magazine I can push in the little pin that links the body with the magazine and it un-jams. The pin seems to get stuck but not always. I tried tripping the shutter a couple of dozen times to see if it just needed to be worked but it didn't seem to change the symptoms. Has anyone had this problem? Does anyone know if this is going to cost me an arm and a leg to get repaired?