Double crank mechanism. Turn the handle on the side of the box and the two pads on the top of the box move back and forth in opposite directions.
Members can download the parts for free from the link on the website. The parts are available to non-members for £2.50UKP.
Once you have completed your double crank mechanism it is time to think about how you could add a character to the top of the box. What will you make? A cross country skier? Michael Jackson moonwalking? Two pirates swabbing the deck?
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