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Press the green button to turn the blue crank 90 degrees.
Press the green button again to turn the blue crank back.
Red spring pin moves in X-shaped groove of the blue cam.
The groove has different depths that ensure the pin moves as shown in the video.
This video was made at the request of a KZfaq viewer.
The reverse stroke of the blue button is caused by the force of the blue spring, so it is fast enough to pass the intersection of the cam groove.
Inventor files of this video:
www.mediafire....