The answer is a "fail" light to most of us. "Gimbel Lock" is something by word I mistakenly thought of as a failed Gimbel, wiki gave me some interesting insight and thx for the post. I believe that even the "old Delco" carousels were more advanced to prevent this failure. That being said, I am afraid there are few still alive who understand the answer to your question practicaly or with practial experience..
Miss the old INU's, a hard rerack or drop check to knock the carbon build up off the gimbels used to keep them running.