Hi, I am new to this group and therefore don't know if this subject comes up regularly. I have recently bought a Rollei 35SE/Sonnar. Everything seems to work fine except the film counter on the underside. Looking at the inside of the baseplate I can see toothed wheel with which I can turn the counter easily with a finger. Looking at the underside of film chamber I can a little toothed thing sticking down which looks like its purpose is to engage with this wheel to advance the counter. There is also a metal prong which looks as if it is a ratchet to stop the counter rewinding until the back is removed. Cranking the film advance lever (without a film in it) does not seem to make the toothed thing move at all. Any suggestions as to what might be wrong? thanks Stewart