• Nindelofocho@lemmy.world
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    14 days ago

    A handful of small metal balls inside it and a magnet at its holding spot is all it would need id imagine

    • TheOakTree@lemmy.zip
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      13 days ago

      I was thinking this too. Four captive rollers in a magnetic frame on the inside of the ball, and a moving electromagnet below the floor to guide it.