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Author Message   Lrsnrl Tinkerer Username: Lrsnrl Post Number: 28 Registered: 02-2010 Rating: N/A Votes: 0 Posted on Saturday, April 06, 2013 - 09:42 pm:    The lever that portrudes into the lens housing mates up with another lever that cocks the shutter. The "design" you see on the frame ad- vance knob is actually a cam that moves the steel rod that is sitting on top of the two gears to the right on your picture. This causes the lever portruding into the lens to cock the shutter.