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Tri-lobe equipment adjustment knob (parametric)
I bought a router table at a garage sale for a buck, but it was missing a knob.
The STL included here is for a 1/4" nut and bolt to match that device, but the SCAD is parametric, you can make any size you like.
You could also put a bolt in the captive position instead of a nut if that's what your application calls for.