Original set screw knobs in Decent condition are super rare
I have like 4-5 only and it took me about 12 years to collect that many without shelling out eBay prices for a whole radio just for knobs

I have a friend who made 3D printed replacements using originals as an example
He made them accept a brass insert that contains the set screw and the tone knob had a laser cut stainless insert to grab the control shaft
I regret only having a few printed, next time I’ll pay him to make so so many for all of us bolters.
-s