Husband who built his clock said check the battery install. The batteries run the pendulum. Also make sure its mounted vertically and that the attachment to wall is secure as weight of the pendulum will unbalance the clock.

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3D Puzzles for Adults Wooden Clock kit DIY Build Mechanical Wall Clock Hanging Pendulum Clock Puzzle Gift for Aldult and Teens

Q: This clock 3d puzzle can any damaged parts be fixed?

You can use glue to reinforce the puzzle. If any parts are damaged, you can ask for a free replacement with free shipping by Amazon. As is the case with wood, changes in temperature or humidity will cause the wood to expand and/or contract, which may damage the pieces.