I've looked on the forums for anything on cleaning a Unicum shutter, but didn't find much. Google didn't have much at all either, so I'm posting this.
I know these shutters are not very reliable with speeds, and apparently are not very good, but this one has been fine for paper negatives...up to now. It has a lever as well as a pneumatic bulb piston. I've been using the lever, and it's been working fine, then it started sticking, and now it won't go off the settings like before, though the shutter opens fine, with no lag. I have to nudge the brass dial to make the shutter close. I cleaned the piston last night, and all of a sudden everything worked well. All speeds were good. Perfect! Thought I'd fixed it.
Then today it's back to sticking.
Do I have to clean it more than once?
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