Wind spinner was beautiful and spun well, but I wanted smoother spin and to hopefully get it moving in lighter breezes. This modification uses the ball bearings I had on hand and I have linked below what I originally bought. These slide very snuggly onto the main body and slide in easily for the wings. I have not tested outside yet, so I might have to slightly increase tightness or just glue them in place. In practice, they stay on well.
Edit: Ended up putting a touch of glue on to keep the wings in place on the bearings. It's just slightly too loose. Adjust accordingly or just glue like me.
https://www.amazon.com/dp/B0C9MKP3WG?psc=1&ref=ppx_yo2ov_dt_b_product_details
In case the link ever dies, these are “8x16x5mm Double Metal Shield Single Row Flanged Ball Bearings Deep Groove Ball Bearings”