[R-390] TR: R-390A RF slugs "spring" replacement

[Jacques Fortin]

Hello Jordan,
It was just a trial, but I used something we already discussed about: a
small length of RG-178 Teflon coax with the outer insulation stripped,
leaving only the braid and the internal wire.
Just a bit smaller in diameter than the original bronze spring.
I glued that piece to both the brass screw and the iron dust slug using only
a drop of cyanoacrylate glue.
The result can bend slightly, like the original spring, but is invariable in
length.
And not magnetic....
Tested it using a wire coil on a HP 4192A at 10MHz: within 2 % compared to
the original (with the bronze spring) part.
No significant differences in the ESR, indicating no added losses from the
"repaired" slug.

I will write something about, with pictures...

73, Jacques, VE2JFE