My favorite shutter mishap occurred about 20 years ago when I was cleaning some Dial Set Compurs using trichloroethylene. I had about 20 or so of the DS Compurs and all had metal blades, but then somewhere I unknowingly got hold of a model with hard rubber blades. Soon after I swished the shutter around in the solvent, all of the blades shriveled and curled up . . . ruined!!