Or does it just need some TLC? I stupidly left it sitting for a long time with a blade in it, TTO ring all the way tight. When I tried to open it today the TTO knob really resisted my efforts, almost couldn't get it to move. I finally got it to open, but now that last quarter turn is really stiff tightening and loosening. I soaked it in dish soap and water for several hours and that had no effect. Maybe it needs some oil? But what kind and how to do that? Maybe there's something else I should do to get it to operate smoothly?