ottluuk
the indecisive eternity
Thanks.
Well if you look at the pictures you'l'l see the screw is still there (or at least I think that's the one we are talking about). I have now screwed it back on, so it should stay there. I didn't think of a CLA because I don't want to send the camera away yet if it isn't a major problem. Seemed something I could fix myself.
It's not quite clear from your pictures whether the set screw is still there. It's the tiny screw on the side of the rewind crank:
A jeweller or watchmaker who can repair spectacle frames and such could probably find a suitable screw for you, if it is lost.