I assume the part you are having problems is the same as on a C3. Under the cover on the right side is a paw mechanics that stops the film when it reaches the next frame. The grease dries up preventing it from dropping in, allowing the film to keep winding. It has been years since I repaired mine, but it was easy. The covering is pried up, knobs removed, then the cover's screws. Once removed it is simple to clean and re-lube. Somewhere on the internet there is a repair manual that shows this, although it may have been for a C330. I've owned a C3, C220, and currently own a C330f, and have used a C33. They are great cameras, and easy to repair.