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Model dimensions:
Model consists from parts: body, frame, right and left worm, pins. Pins need to be from metall.
Useful links: https://en.wikipedia.org/wiki/Screw-propelled_vehicle https://www.youtube.com/watch?v=_Z2AL34xpw0 https://www.youtube.com/watch?v=lREoieCq_Co https://www.youtube.com/watch?v=HB_a5R6QjWE