I used to double sided tape my control knob under desk and it was working but wasn't perfect. Tobias Ravnholt design is great and I decided to make some small tweak to be easier to mount and print.
if you are from US and don't have access to metric screws - please make remix for imperial screws and share it on Printabels
____________
Skechup file included - feel free to remix and share
The author remixed this model.