Good idea, I already have that....Look into the smallest size solder wick. Usually looks like the same stuff once tinned. And cheap.
This looks similar to the braided ground wires Fender used on the cathodes of the power tube sockets:
http://www.amazon.com/Small-Parts-Tinned-Copper-Braid/dp/B003R501JU
Yes sir, I like that...Something like this... ?
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That is a tough one. Problem with all of the braided wires people have suggested is that they aren't flexible enough. If you tin plain copper braid, it will become rock hard. I hope the sample being sent to you is the correct stuff. The only braid I can think of that would come close was used in vintage phonographs for the pickup lead. It was extremely flexible and could bend back and forth without breaking down. You could pull the center lead out, then use the braided shield only. The only other close thing I can think of is tinsel wire for high powered speakers, but then that is almost too flexible. If I encounter one of these amps with the cathode wires damaged, I just replace them with a bit of 14ga copper buss wire - not original, but clean install & will never break.
Problem with all of the braided wires people have suggested is that they aren't flexible enough.
I have to disagree here. We are not talking about a high flexibility requirement application in the first place, what we're talking about (I think) is a restoration application for older Fender braided grounds like this: