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I recently got an early variant of PRONTOR shutter with a 75mm f4.5 Ensar lens, evidently from a unit-focussing Ensign camera.
After the customary flood cleaning, including a few minutes in an ultrasonic bath, the delay and escapement mechanisms were removed. Loose rust was removed; the remaining dark spots seen in the pictures are where surface rust was breaking through the plating of the metal surfaces.
After a frugal addition of Moebius 8000 watch oil to the various pivots, all seemed to be well except for the escapement sticking, exactly the same as was shown for another early Prontor shutter here. That was also labelled simply PRONTOR, and had a similar design of escapement, although there were differences elsewhwere, notable the orientation of the delay mechanism being transposed.
In the case of my shutter, I found it ran properly after I re-assembled it with the (symmetrical) escapement rocker turned upside-down.
filthy top plate (arrow) filthy vulcanite (circle) and note the windows are filthy too.
see the entire set here: Leica IIIa CLA
CLA the slow speed escapement, after the cleaning ~MOVIE
Works like a charm. This is the 1 (one) second shutter speed setting. It was more like a 5-6 second before the cleaning.
see the entire set here: Leica IIIa CLA
The amazing beauty of Clara. First (and of course not last) collaboration with her.
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CLA the slow speed escapement
This pin (circled) lines up with the fork in the camera. I gave the bearings (arrows) a touch of watch oil. I put a drop of oil on a piece of paper and touched it with my smallest screw driver, then touched the bearing, letting it wick in then wiped off the excess.
see the entire set here: Leica IIIa CLA