UGEARS has another awesome mechanical model for you to play with. The UGEARS Hurdy-Gurdy is a musical instrument model that you can self-assemble and play. To play it, simply turn a crank with one hand and push the keys with the other. The model comes with everything you need to put it together.
The Hurdy-Gurdy model can be assembled with no glue. It has parts cut from a plywood board with extreme precision. You can even tune your musical instrument to get better results.