Review on Master the Art of Mechanical Construction with ROKR Building Construction Mechanical Pendulum by Robert Toomey

Bought this for my son as a gift and we had a lot of fun putting it together. However, he was very disappointed when it didn't work out in the end. The pendulum kept swinging. It is very important to do everything correctly, and instructions will not help. The manual says no glue is needed and the pendulum bob loses momentum when swinging as the parts flex a bit. To fix this you need to glue parts D1, D3, D4, D7 and D8 together and make sure that D8 and gear C5 fit together perfectly Miscellaneous. centered on each other. After that it worked fine. You'll have around 3 hours on completion, after which you'll need to pick up the pace again.