The CUCKOO clock is the kind of clock that people either love them or leave them. I myself have never had one on my wall except to regulate it for a customer. Though I have bought and sold plenty of them. You can pick them up at flea markets for next to nothing and with a little work turn a good profit from them. They can give years of enjoyment if you follow a few simple rules. The 30-hour cuckoo clock is a very low maintenance clock. Just wind it every day and enjoy. A lot of people that own them have to make a habit out of winding the 30-hour clock. There is also 8-day cuckoo's that have a much bigger weight on them. I cuckoo with two weights will have time and strike. A 3 weight will have music, some with dancing people, dancing birds, people drinking beer, a farmer chasing someone up a ladder with a pitch fork or a water wheel and so on. I have repaired a lot that the Grand kids have gotten hold of. These usually result in stretched chains or broken first wheel (that's the one that makes the clicking noise when you wind it) The repair of one is no different then any other clock movement. The tricky part is all the barbed wire in the back. Those are the ones with animation. They can be tricky getting everything in the movement to operate at the right time. The strike sequence of a cuckoo is the Gong then the cuck-oo. The bellows are what produce the air for the CUCK-OO. They look like the things the old blacksmith's used on their furnaces to put air into them. The movement lifts them and them drops them in the right order to produce the sound. Over time they get hard and the leather or paper on them will tear or get rotten. Most times the repair will include new ones. Ask and they should tell you if they need to be replaced when you drop it off. If you take the back off you can see them on ether side of the case on top of square tubes. Most every cuckoo movement can be bought new still to this day. It might be more reasonable to replace the movement then to repair the old one. The clock shouldn't be hung by drafts as the pendulum is very light and is pretty big. So a door slamming could cause it to swing into the chains and stop the clock. If over time the hands on your clock get out of sync you can adjust them. They have a hand nut that hold the minute hand on. Just move the minute hand till it strikes, stop the clock, loosen the nut and move the minute hand till it is in the right place. The hour hand in on a tapered shaft so you can move it where you need it. Anything else you need to know just let me know, no sense going CUCKOO over a clock.