disassembly instructions for a Fed 5C?

[paul beard]

I just got my first FSU rangefinder and despite the seller's claims of minty-ness, the rangefinder mirror has come undone: looks like the balsam has expired. I would like to get the top off, confirm, and repair, but it's proving difficult. I have the rewind side taken down to where I need it but the speed control knob and the various rings around the rewind shaft (the stuff that goes with the meter that I wish I hadn't bothered with) are still eluding removal. The set screws are out.

Any clues for the clueless? Rick Olesen has been consulted but he's never had one of these.

 

[jn053]

Once the knurled rewind knob pops up (press in the center
and turn CCW), all you should have to do is unwind the knob
and then go down with a tool of some sort to remove the
slotted securing nut. You don't have to take the periphery screws off.

 

[paul beard]

Once the knurled rewind knob pops up (press in the center
and turn CCW), all you should have to do is unwind the knob
and then go down with a tool of some sort to remove the
slotted securing nut. You don't have to take the periphery screws off.

Hmmm. The rewind knob was easy. I don't see a nut or fastener in the center of the various ASA/exposure dials. I see what looks like a spring clip, like an E or C clip but in a full circle. :bang:

Gah, it looks like those bits stay on the top. So I guess it's the shutter speed knob that's holding things together. The set screws are out but I have no idea how it comes off.