I haven't seen the related posts that you referred to. But Sphere Research is one good supplier of parts for older Tektronix (and HP) gear, some of which used dual concentric potentiometers. So maybe they'll have some of what you want:
http://www.sphere.bc.ca/test/tek1.html
- Tom Gootee
http://www.fullnet.com/~tomg/index.html
http://www.sphere.bc.ca/test/tek1.html
- Tom Gootee
http://www.fullnet.com/~tomg/index.html
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