http://www.butkus.org/chinon/agfa/ag..._solinette.htm

More or less all original condition Agfa cameras have a jammed focus by now. This is because Agfa used a variety of grease that eventually turns to concrete. It can be freed by injecting WD-40 lubricant or similar into the focus helicoid little by little and let it stay and do its work until the focus gradually starts to move again.