my cuckoo clock is fairly new. The leaf stops ticking after 2-3 minutes. I tried moving the leaf up and down. I got it to work once and when the cuckoo went off it was in slow motion. I checked the chains around the pulley and they are on track. When I pull slightly on one of the cones it speeds the pendelum up like its going to work again. Anything else I can look at? Thanks, John