I've got a lot to learn about turning.   The last time I had any instruction was in wood shop class back in jr high school.   I'm retired now, so you can do the math - it's been a while.   Armed with my wealth of knowledge, I managed to get a little cocobolo knob turned for the rotary dimmer.

At least it's a step up from plastic.

Just sanded through 1000 grit.  Over time, the cocobolo should oxidize to a fiery orange and match the cherry a little better.

It's kind of rudimentary as far as knobs go, but it will do.