Mount your new cuckoo clock on the wall as directed by the manufacturer.
Undo the twist ties around the plastic bags holding the chains protruding from the bottom of the clock. Unravel any knots and straighten the chains out so that they hang freely.
Carefully remove the twist ties holding the chains tightly against the base of the clock. These ties prevent the chains from slipping off the sprockets during shipping and while installing the clock.
Secure the weights by looping the hooks attached to the ends of the chains through the holes in the weights. A standard cuckoo clock has two chains and identical weights, but if you have a musical cuckoo clock with three chains protruding from the bottom and three weights provided, hang the odd sized heavier weight over the hook on the central chain; this chain is usually labeled and marked as the music chain.