Here is another simple magnetic toy that puts on a trippy show as you give it a spin. The Magnetron Magnetic Fascination toy by Andrews Mfg has 3-arm 2 rotors, each with magnets. As you spin one, the other starts spinning and angular momentum bounces back and forth between the rotors.
Magnetron Magnetic Fascination Toy 🧲 Gadgetify
These are pretty hard to find but you always have a chance on sites like eBay.
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