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We figured that attached to the main drive shaft was a spring that wound up. After that was a gear turned a gear behind that. The second gear was then attached to an axle. At either end were two disks with off-center pegs that, as they went around, shook the dragon's booty, thus providing a forward vector. The head, we figured, was attached to a vertical axle, which  had a flat disk with a universal joint off to one side. This U-joint had a rod, connecting to the drive gear with another off-center U-joint.

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