Lego Automatic Gearbox (3 speed)

While I take the train to London, I have plenty of crazy thinking time and so I think about what I would like to try out.  So when I get home I build little simple projects like a 3 speed automatic transmission.

So this works by centrifugal force, the faster the motor turn the yellow thing (will think of a more technical name) the more it expands and pushes the center axle up.  This forces the gear changes.  The motor is controlled via a RCX as it was part of a display.

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