Voigtländer Vito CLR shutter
I bought this Voigtländer Vito CLR for a song from a parts bin. Its shutter dial was stiff, so I dug in to find out why. A simple clean and grease of the helicoid has it working much more smoothly.
I read a thing on the internet where someone used part of a CD case and some frosted tape to make a "ground glass" for focus setting. I used a piece of transparency (e.g. for overhead projectors) because it's easier to work with and just as effective.