Sweeeeeet!
Two thoughts..... 1. cut a deeper recess for: 2. Velcro, or to epoxy a neodymium magnet in the knob and a corresponding thin mild steel/tin disc under the logo, if nonferrous.
My OCD polishing scenario consists of HAND sanding from 150 grit, 220/320, 400, 600, 1000, 1500 then...