[Diverted]

Thanks for all the help so far.
I have done very little with this set, apart from replacing the candohm and burned out 5.6K resistor today. I am looking around the set for issues and today found a cut ground wire attached to the RF section. See pic. From the parts diagram/layout drawing, this appears to be part 20, a .05 cap that connects to Position 4 of the RF transformer, one side of the shadow meter, and some other parts.
I have looked around this part of the circuit and cannot find a replacement cap; so I am unsure why someone in the past cut this out of the circuit and didn't replace it.
Two questions:
What does this cap do?
Also, would I be able to tie a replacement .05 cap anywhere along this node? Or should I try to keep it as close to the transformer as possible? Getting it in there will be tight, as that transformer is buried in the RF section. I would be easier for me to tie it into the shadowmeter, etc., but don't know if that's kosher.
Thoughts appreciated, thank you!

PS: Turns out the on/off switch is shot. Someone intentionally shorted it out with a soldered in wire, so I'm looking for a replacement if anyone has one. See the WTB section.

Ted