The ball stopper

This drawing shows the ball stopper. A "wheel" with four arms rotates a quarter revolution every time a ball is allowed to enter the plexiglass tube.

The grid spacing on the drawing is 1 cm. This part is screwed to the back plate (from behind) to allow easy access for adjusting. It can also be disassembled. The back piece is screwed to the spacers, not glued.
 

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Last modified 15.05.98