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you might try Mark Oppat I think he is in the midwestern US but that may be a person to order a new one from. it will be a mail order thing, I have bought knobs through him before, and I know he has a lot of pots, He coins himself "king of kontrols" 🙂
moppat@comcast dot net

I have a few miscellaneous chassis and parts so I usually just rummage around until I find one that’s close on the rare occasion that I need one. – or I go to our local place "main electronics" on main street possibly. if you get stuck you could send me a pic and I will have a look around.