MPSM Spinner Knob

There are many replacement knobs for the MP Select Mini, but none that I found easy to use. Some have a small dimple, Some have a low profile, Some have a nice knurled surface. But I couldn't find any that had a Low Profile, and a nice Knurled circumference, AND a deep dimple to help keep the knob spinning when doing those slow Z moves.

UPDATE: I made the hole for the encoder shaft a little shallower to make sure it bottoms out. This ensures that the switch will activate when the knob