wrote in message
...
That amp in Spinal Tap is a weenie compared to my auto dark hood, it
goes to 13!
Eric

I've started using spoked handwheels for electronic control knobs.
This is still small enough for fine adjustment:
https://www.amazon.com/uxcell-Diamet...0533123&sr=1-3

The center hole runs pretty close to true when chucked by the ID of
the rim in a 3-jaw, to bore for the control shaft adapter.

-jsw