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  1. Looks like he added it in one of the photos, but if you’re trying this at home…

    Put a layer of cloth/foam/rubber/etc between the two sets of magnets to avoid chipping (thickness can be less than a dime). Neodymium magnets are brittle, and the attractive force goes up ~~exponentially~~ **dramatically** as the two magnets approach each other. I’ve chipped and broken magnets by letting them slap directly into each other.

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