Night before last I sat down and worked on modeling the origional knobs I'd used so I could print some repalcements.

In the origional design, the knobs operated potentiometers, when that went wrong I changed to digital encoders. The potentiometers used a knurled shaft, but the encoders use a D shaft, so I had to give up the origional knobs.
One of the many project distractions has been the construction of a 3d printer, which I can now put to use to make some new knobs in the origional style.

So, here is what I made.

They are a bit close to the old one, there is no point on notches and dots to indicate where the knob is , as its free spinning. yea, I painted it silver. I can think of about a million ways to improve the design of the knob, and I can do that later one day.

But for now, they are on the power supply. I think this is the first photo with the... pinstriping, I added :)