They are pretty easy to work on...not a whole bunch going on in there...
Start
here
I've had an Argus C3 for ten or more years...forgot where I got it or how much I paid for it...but it just sat in a bottom dresser drawer all this time...just a few months ago I decided to get it out and really have a good look at it...I opened it up, cleaned it and then put a new skin on it...it's ready to go now and it really looks great...
They are neat cameras to play with and they can produce very nice (sharp) negs...Just don't drop too much into them as you'll never recover your investment...some will say that $25 is too much for it...I have at least $30 in mine and that includes the new skin...