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Author Message   Glenn Tinkerer Username: Glenn Post Number: 934 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Tuesday, June 21, 2011 - 06:19 am:    I am not familiar with this shutter, but the fault is obviously a faulty/misplaced latch or blade closing spring - as Ron and others have surmised. your flushing out the mechanism will have cleaned it well after the first application of solvent, the fact that the shutter functions properly when wet is to be expected and easily explained - surface tension, between the blades and the layer of solvent, is sufficient to make up the loss in mechanical resistance due to the faulty/misplaced spring.