Have a favorite fidget spinner but not enough skate bearings to fill all the holes? This simple and customizable gadget will convert your all-bearing spinner into one that uses hex nuts for perimeter inertial weights.
You can also add some variety to your spinner by printing these adapters in different filament colors.
20%, although 100% will add even more weight
If your nut's fit is extra snug, I recommend pushing the adapter into the spinner first, then tapping the nut in with a hammer. The corners of the adapter can get thin, so inserting the adapter into the spinner will help prevent splitting when you add the nut.