For BTB Flint and Steel strikers and Fidget Spinners.
Frictionless Bow Drill Spindle retainer Cup can be installed on the F608Z Ball Bearing in a Flint and Steel Striker "BTB Ball Bearing Mount".
Also shown in Stand alone" and Fidget Spinner configurations.
Convert a Fidget Spinner to a Frictionless Bow Drill Ball Bearing Block.
Make your unused Fidget Spinner Great again !!
...and other 608 ball bearing gadgets...
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