[R-390] Lubricating RF slugs [WAS: Need R-390A Iron Core Slug]

[Tisha Hayes]

I would stay away from graphite as it will change the performance of the
inductor.

Oil also has a negative impact upon certain types of slugs and cores.

Talc is a safe lubricant if it is used in extremely small quantities.

Try a loose fit of a single slug into the coil form to make sure that it
does not bind or hang. If it does, then there is damage or contamination in
the core. Clean out the coil forms with a dry Q tip until a clean Q tip
comes out as clean. Then put a very light dusting of talc (baby powder) on a
Q tip and give the coil form a dusting.

If you can get a single slug to move freely with no binding but it binds in
the rack then there is a misalignment problem or the slug rod is bent.

If the slug binds after all of the cleaning you can try to inspect it with a
borescope or remove the coil from the radio so you can see all the way
through the coil and look for galled up spots in the form. Some can be
fixed, others will require the complete replacement of the can.

-- 
Ms. Tisha Hayes

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"I will not recant the truth. I am corn, not chaff; I will not be blown away
with the wind or burst by the flail. I will survive both."
-Walter Milne, 1558