Swinging girl pendelum clock. Or a clock specialist can do it and hit a few of the inner parts at the same time. If we turn the switch for the Cuckoo on it will Cuckoo until the chain weight fall to the ground. You probably get this often but I am interested in the art of building cuckoo clocks. It has been well but now will require a complete overhaul to be fully operational. It is a classic design, with the leaves on the front and a bird and leaf e henti. I have moved the leaf to the very bottom of the pendulum but still my cuckoo clock gains time. Hello Ruth — That is probably the rack not falling into place. There are many cuckoo clocks out there since they last for so long when taken care of. But I could not see any sticker indicating it is a Certified Black Forest clock. Then you could buy a mechanism and put it inside. Regards Isaac S. Unfortunately, that really is a job for a professional cuckoo repair center.