To all the above who commented thanks so very much! I was photographing today and the focus ring slipped again (I mustn’t have tightened it enough last time I was in the lens) so I decided to have one more attempt at adjusting it before sending it to a technician. Four hours later I got it! I am so happy you all chimed in, I was given the confidence and advice to take this project on and it worked! I might blow through a full roll of film in the next 24 hours just to get it in the soup ASAP and see if I scored a 100%. Jury still out but think I got it - infinity looks spectacular and close focus was looking good - plus the lens didn’t fall off when close focused, which is key (gotta be safe)! I also was able to engage the aperture too and am now able to stop down if I ever wanted to! Gosh, I almost want to buy a beat up rangefinder now and try to bring it back to life?? I might have the bug now...it was really elegant inside that lens seeing all those gears, springs, etc...