Hello NAWCC Community: I have an old quail cuckoo clock that I purchased and did some minor repair work on. It runs great as long as the minute hand nut is not on too tight. The hand nuts are the antique style with a "top hat" shaped nut going on the arbor first, then the minute hand goes on and then the minute hand nut is the last nut on the arbor. If the minute hand nut is on too tight, the clock will continue to run but the hands do not advance. If the minute hand nut is left loose, the clock will run and the hands will advance. This is perplexing to me. I don't understand how the clock even "knows" that something is attached to the minute hand arbor, tight or loose. I might just not understand something basic here and hope someone has the answer. Thank you in advance for you experience and input.