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Uploaded on 18 Dec 2008
This is a breathing mechanism for a stop-motion animation puppet I'm building - the video is just a demo to show how it works.
Note that this video shows the hinged arms turned away so that you can see more of the threaded-bolt/wingnut mechanism - the wingnut has a piece of squareish plastic epoxied to it that stops the wingnut turning and losing contact with the hinged arms (I added this note after Vortex42's comment alerted me to the fact that I had not made this at all clear).