I presently have an original C35 but the shutter blades decided to stick together even though it would wind and the shutter would click. I played with it for a while then decided to do something I haven't done before. After swabbing the blades with a Q-Tip and lighter fluid, taking a double pointed toothpick, I opened the back and attempted to help the shutter blades separate from each other when I clicked the shutter. After taking 4-5 attmpts, the blades started to move, and with a little more help actually opened and closed. After around 15-20 winds and clicks, it appeared that the blades were working as they should.
I decided to take it to Russia with me for some RF shots and in St. Petersburg it started acting up around frame 20 or thereabouts, which I found out about only after the roll was developed. One side of the frame was blurred as though the shutter was dragging a bit similar to one curtain on a slr dragging a bit. Opened the back up again and fired it off around 10-15 times while holding up to the light and muted light, and everything looked OK. Shot off a few shots with fresh film and they came out just great. I've been shooting a C35 since 1970 when I bought my wife one while living in Sasebo, Japan - I like them and they do take great pictures.