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What is the purpose of using bearings for the counterweights? Any advantage over a solid piece of metal? I see lots of spinners with bearings for weights but never see them being spun on those off-center bearings.
If I had to guess, production cost. They are already cutting the holes all the same size, and already ordering the materials to fill those holes, so why not. I can't think of another reason but I only have a theoretical degree in physics.
It's so you can hold it by one of the other bearings and wiggle it around. It just offers multiple ways to fidget with it.
Having a degree in English, I must ask you whether your degree in physics is theoretical or if your degree is in theoretical physics. <wink>
I theorize that that is the joke. Logical Disruptor.