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In addition to Sariel's excellent book, I'd suggest Yoshihito Isogawa's "Tora no Maki" downloadable PDF book, and his Ideas books in print. All are full of clever mechanisms, easy to reproduce and integrate into bigger constructions. See


Yes. There are over 30 types, depending on box size. Some of them look more like books. Some of them are impractical, and haven't been used since their creation.


It is not spring loaded, meaning if you set a dial to a specific value it will stay there. There are two channels that can be controlled with the two dials, and either can be set in one direction ("forward") or the other ("reverse"). I put these terms in quotes because their exact function depends on your model, but in the simplest scenarios (like ...

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