Lego catapult

I built a Lego catapult that is capable to wind itself after pressing a lever. When the catapult is fully wound it automatically disconnects the motor from the winding gear using a gearbox and stops the motor.
Meanwhile the winding mechanism is held in place by a stick that stops the gear attached to the winding axle from rotating backwards so it doesn't unwind until the release is pressed.

You can see the full annotated gallery on Flickr.

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