Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4633202.
I needed a knob for an old radio I was working on for a customer. Since I couldn't find one in my knob box (what? Doesn't everybody have a knob box?) I whipped one up in FreeCAD. The shaft is a standard (for the time) 1/4" D. The pointer position may be specific to my application, but... I'm the one who took the time to model it so :P