I was lucky enough to find my grandfathers 1960's slim stuck in a drawer. I was able to shine it up well based on things from this site. My problem is the adjuster dial won't turn past 5. I have taken everyone's advice and soaked in dish soap. It has been a fairly long time and no change. The water stays clear. It is perfect smooth twist up until 5. My question is could it be broken or is there some other trick I could try? Currently I have been using dawn dish washing liquid.