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
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