I have an Argus C3 circa early to mid 1940s and the rangefinding alignment dial is very difficult to turn. I would like to know what my options as far as lubricating it so that it might turn a little easier. I have key oil, which could become a problem by getting into places I don't want it to, and I also have some graphite powder which might present some of the same problems. The only other thing I can think of is a graphite lubricating pencil of some sort. Do I have to take it to a shop and have them overhaul it, or could there be another solution? The camera is still usable in it's current state, but still I am looking for an inexpensive solution to the problem described above.