• if a 16kg pull magnet isn't enough i doubt a sewing needle will do.

    Leverage not magnetism, it's a completely different principle of physics as the ball bearing will not be loosing contact with the nut and therefore you are not required to break the magnetic bond until it is out of the hole.

    Give me a place to stand and I can move the Earth - Archimedes

    You'll note he said this about levers, he never attributed the same claim to a big ass magnet.

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