Hi, I am fairly new here and have been looking for a repairs section. Is there such a forum? Anyway, here is the question. I had to take my trusty Steinheil Quinon apart to get the focussing back to how it is supposed to be. After a long time puzzeling I got the lens back together again (sigh...) but after cleaning the focussing helicoid it should get some new lubrication. What to use? Thanks, Rob.