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Hi Bob,
If you have difficulty finding the original four center knobs you might want to try and fabricate some using grey National NC radio knobs painting them the appropriate color and gluing in a brass insert. If you look at the center knob in the first photo and compare it to the outer knobs you can see they are the same except the center knob does not have the insert and the outer ones do. The center knob is the same knob used in many National NC radios. I have seen these on ebay quite frequently also at ham swap meets. The inserts are actually pretty easy to make. I took a jewelry/ metal fabrication class at the local community college a couple of years ago we made something very similar these. If you end up going this route I will check to see if someone in the class would make some. I could get the brass at Ace hardware.
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