[ARC5] UK TR9D: Disaster Strikes!

[David Stinson]

Easily the most historically-important radio in my 
collection is the working U.K. "Battle of Britain" 
TR9D HF set.  Excellent article:
http://tinyurl.com/h5c92k6
In this example photo, the transmitter 
is on the left, the receiver is on the right.
The radio mounts with these controls facing up.
https://goo.gl/photos/mXf2RfoHkbB8ffN79
The receiver has a bottom cover with a lip all-around.

In short- the roof in my storage area sprung a leak.
You know, there are gremlins in the world that make
sure things go just like this:
Water dripped on and through the cover over the 
radio.  It couldn't drip just anywhere, which 
might have run-off harmlessly to one side.  
Of course not; it had to drip right on top 
of one of the tuning knobs and run down
the tuning condensor shaft, pool between
the plates for a good long while, then make a pool
in the bottom of the receiver about a 
16th of an inch deep and stand there 
long enough to do this:
https://goo.gl/photos/MoUQ4vYZLbcxK3jj7
The rusted caps are 0.5 uFd bypasses and couplers
that appear to have Steel cases and they are rusting
faster than one would imagine.  I have "tacked-in" 
replacements for the dead ones but wanted to keep
the original parts in-situ.  You might notice on the left
how I've "tacked" modern resistors across the originals
to bring them back down to spec without removing them.

Worse:  The aluminium used for the capacitor plates is 
some mild variety that corrodes easily.  There were
a couple of mounds of corrosion between the plates
that "welded" them together, shorting the cap.
I was able to remove it (Lord bless the UK engineers
who knew how to make a radio easy to fix), soaked 
the plates and corrosion with De-Oxit and, with a thin
relay burnishing tool, managed to remove 
all the corrosion between the plates, 
leave a thin De-Oxit coat to retard future corrosion 
and save the cap.  
https://goo.gl/photos/SsSJNr7r2SBY3jcD7

Also- in the upper-left corner of the RX bottom photo,
you'll see the Microphone transformer, which had
its laminations in the pooled water.  I can try coats of
thinned "rust converter," but a couple of the laminations
have already rusted-through and fallen off.  The rust
may not be "cure-able" for this part.
https://goo.gl/photos/VE7YWZVLuYnP6veF7
Your opinion: Can I leach enough "rust converter"
into these laminations to save the part?

The set is still working, but I need to get ahead of this
rust.  I can remove the caps, clean and stop the rust 
and repaint, but I need a good clean template to 
recreate the label.  Here is the best one of the lot:
https://goo.gl/photos/cjEdnrZVxdSeNYuq6

So I appeal to our U.K. members:
Does anyone have a clean example of this capacitor
I could use as a template?  Doesn't need to be 
"good;" Just clean.

Does anyone have a good TR9D 
Microphone Transformer (40:1) in their junk box?
Parts list calls it:  Transformer, Microphone, type 51.

Lastly- Does anyone know the specs of the carbon
mikes used with this set?  U.S. carbon mikes, which
were designed for several volts excitation, don't work
well with only 2V available.

Thanks for any help or thoughts.
73 DE Dave AB5S