There has been a similar discussion here, only that the camera was Agfa Isolette: http://www.apug.org/forums/forum147/...tuck-8-ft.html

Basically, lighter fluid and heat or disassemble the focus ring and clean out the old grease properly and regrease. Depending on the complexity of your camera (I am unfamiliar with your camera so I can't tell), it might be a better idea to send it out to a professional to clean.