I tried to make one once. We took a piece of aluminum pipe like for flag poles welded a piece of metal to one end, cut a hole in the middle the size of a can, cut a hole by the welded piece of metal on the pipe itself about a quarter of the original size of the can, got an electric motor , and a piston from a lawn mower, atattched the piston to the motor. You would turn it on, drop the cans in, and they would fall out the other end.
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