I have recently been selling off spare stock from my collection. The first watch I sold, mid 19th century lever, I said it ticked. Purchaser has said the hour hand dioes not advance and is loose. I had not noticed but then I wouldn't usually run it without servicing, he asked me if it ticked and I checked that it did. I've said I will take it back but presumably this is just a friction fit? It sounds like a simple fix, I'll just sell ir again with the fault noted. I just wondered how hard it is to fix.