Yesterday and today I fixed a stiff shutter dial on a Voigtländer Vito CLR. I picked up the camera for $10 at a camera fair, as it was in a parts bin. So far, the main problems I've found have been a stiff shutter dial and a loose light meter illumination window. The stiff dial turned out not to be something jammed in the shutter, as I had suspected, but a dirty helicoid for the ISO setting dial which is linked to the shutter speed dial. I cleaned the helicoid and lubricated with some Helimax-XP and it's... better. The helicoid really needed a soak in some solvent to clean it up fully. Nevertheless, I cleaned off a lot of old gunk and the new grease brings a significant improvement (i.e. it can be moved with one hand now).
While I was in there, I also put a microdrop of camera oil on each of the spindles for the self-timer clockwork. It works without getting stuck now, which is some kind of miracle. I tested the light meter by comparison with a Sekonic L-208 and it seems accurate. And I cleaned the lenses thoroughly while I had it apart - the glass seems very clear.
A couple of pointers on this repair:
1. My CLR seems to be a newer (or older) model, or something, and it took me a while to find the retaining screws for the focusing ring. All available manuals and descriptions just say "loosen the three screws...", and none of the diagrams indicate that the screws could be hidden. On this model, they are under the distance gauge. You have to turn to nearest focus so that the distance gauge ring clears the shutter nameplate ring when its screws are removed, but then turn it back the other way once it's removed so that you're back at your infinity focus reference point
before loosening the retaining screws.
2. Like a noob, I didn't mark off the position of the front lens element before I removed it. Well I did, but in lead pencil, and that soon wore off through handling. I'm going to euphemistically chalk that up to a subconscious desire to practice setting focus. I've read online about using frosted scotch tape as a makeshift ground glass, but then I read a post by someone who used a piece of CD case with the frosted scotch tape stuck onto it, because it doesn't warp. An inspired move. I opted for a compromise, by cutting a piece of overhead transparency the width of a strip of 35mm film and sticking the frosted tape to that. It's much easier to make and is rigid enough for the purpose.
It seemed to work just fine. Also, a magnifying glass really helps with this process.