Twist a gears
grabcad
The handle, when turned, activates cylindrical and straight bevel gears, initiating a sequence of events. Gravity propels the marble down a roller coaster track, leading it into a screw conveyor that lifts it back to its starting point; this cycle then repeats indefinitely. Check out this video for more details: http://youtu.be/YH3iAyjgxqk
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