Fidget Spinners with 3/8 hex nut weights
thingiverse
Collection of spinners created in Fusion 360. Each uses 3/8 nuts for weights and a 608 bearing. They are tight fit. I use a C-Clamp to press the nuts and bearing in place. For the bearing caps, I put them together then drop a little drop of gorilla glue in the hole on one side. This holds them really well.
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