Not that I believe that it is rigged, but it is possible to pick numbers by making some of the balls heavier than others. I'm not good with physics, but i think that if the balls come out the top, make the numbers you want lighter or if out the bottom, make them heavier.
Or make the pipe the balls come out of, smaller than the balls that you don't want to come out.
Just some options..y'know?
Mark
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