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Published on Nov 30, 2012
Solution to http://bricks.stackexchange.com/q/169... ("[...] what it needs to do is to drive an axle in one direction, and if that axle becomes blocked, make it rotate shortly in the other direction, then resume.")
potential Improvements: - use a Technic Gear Differential instead of a (much bigger) custom-built one - use a Tooth Clutch instead of a rubber band to brake the "unblocker" - use a Gear with offset Axle Holes instead of a "gear on a stick"