Fidget spinning knob

Many fidget toys have ¼" hex drive centers. I find I want a better grip on the center of some models which this knob provides. You can use one side only or use both sides and sandwich the fidget toy between the knobs. The hex part protrudes ~15mm. Once you snap the two sides together they won't come apart! Initially designed for “The Clockwork Cog Fidget Toy (35 Min Print)” https://makerworld.com/en/models/559102#profileId-478276