I will be listing a huge amount of my knob collection over the next several days. I have been stripping old audio, amp, PA and test gear equipment since the 70's. I will be scattering these adds in whatever section I feel they will be looked at. When I list 2 or 3 of a matched set, I'll put them here, in this category,  for anyone who is building custom made stompboxes, like distortion or choruses, Vibes, etc. I'll describe them the best I can. I'll add more exact info later as I have no micrometer any more, but I'll try to borrow one from a friend. Ask anything about these and I'll get back to you.
Here is a really nice voltmeter knob with microvolt on the skirt. This skirt won't come off so this is what you must use it for! For 1/4" round shaft with 2 Allen screws. I just noticed that one of the set screws fell out, but I will replace it before this add ends or if someone gets it. Very nice and original looking. I'll get back with more info when I figure it out. Could use some cleaning.
Thanks for looking and I'll keep lowering the $ until they sell.

Just to say- I have a lot of interest in these knob sets so if there are any sets left when these adds end, I will relist in bigger sets. I will probably combine lots of these adds into identical shaft mounting styles. If anyone is interested in getting lots of these knobs of same mounting style or whatever, just email and I'll relist that way. It is a lot of trouble to pack and ship, so I might as well sell as many knobs in the same add!