while I have your attention-what sockets did you use for the fitting the 2520 in your build?I know the part number of the regular ones but the ones you used seemed to have a rubber grommet like thing much like the original
[quote author="drpat"]You're talking about the frequency select knob for the SS HF ATTEN section, right?[/quote]
Correct ..I got a winged knob with a aluminum insert on top.I was thinking I'd spray it with black paint and use it ...big mistake first of all the knob I got was much bigger than the original.Secondly I discovered that the knobs are kind of unique..there is a small groove in the original knobs (all of them- wing,big knob and small).
The wing knob body dia was approx 18-19mm and the wing dia seemed same as the big knob skirt dia.
It'd be really great if you can find those knobs at your surplus store