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F: This lever rides on a cam on the Face Plate. When you rotate the Face Plate to set the
shutter speed to B(ulb) or T(imed), this lever sets the mechanism in B to the proper
position.
G: This lever also rides on a cam on the Face Plate. It controls the shutter speed from 25
to 200.
Fig. 7-5: The pre-war Shutter with the Face Plate removed
Reassembling the Shutter is trickier than taking it apart. The steps are the reverse
of disassembly, but care must be taken to ensure that all of the various components,
particularly the cams on the Face Plate, line up properly. When replacing the Face Plate,
ensure that the Cable Release Socket lines up with its indentation on the rim of the Face
Plate. The two(or three for the pre-war A2B and A2F) levers that ride cams on the Face
Plate must be aligned properly or the mechanism will be jammed. Periodically test the
mechanism while reassembling to make certain nothing is improperly assembled.