My OM-2 developed a sticky shutter (oily electromagnet) problem, so I wanted to clean it. I removed the bottom of mirror box, flushed the electromagnet with lighter fluid, brushed with soft paintbrush and I let it dry for a couple hours. Then glued back the rear part of the mirror box floor, then screwed back the front shield, and suddenly all speeds either on manual or auto would fire like 1/1000. When I removed the front shield, all speeds work fine. It seems the front shield is shorting something, So I tried to put insulation tape on the diode leads which are very close to the front shield. Still no improvement. I painted the back of the shield. Nothing. Still short circuit. Finally I put the insulation tape under the screw holding the front shield. And voila - all speeds work fine again. The most puzzling thing is, that before I tried to clean the magnet, everything was fine - no short at all. And I'm 99.9% sure I replaced it back in correct position. I've had it off before, and I always replaced it correctly... Do any of you OM-gurus know what is it the front shield is shorting ?