I’m looking for a ~24" piece of high-voltage wire. Would anyone have some to spare?
(Can be any color … that’s a don’t-care)
How about spark plug wire that can be bought at any auto parts store, some have it on a spool and sell it by the foot.
Good idea, but isn’t that resistive? No reason to burn up RF power as heat. 
Oops, showing my age there. In the old days spark plug wire was not resistive. You’ve got me there. But, Test Lead wire usually has a higher voltage rating and is more flexible.
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Depending on voltage, you could possibly use the center conductor and insulator from a piece of RG8 or 8X.
What voltage range/wire gauge are you looking for? I have a bag full of stuff I grabbed when some neon billboard signs were being redone.
Oh, anything in the 1-2kV range would be fine for this application.
Cool, I can probably bring something by tomorrow evening, if that works for you. What I have is rated to say 20-25kv. If you need it sooner, you shouldn’t have any issue using the center conductor/insulation out of a piece of coax, as tmc4242 mentioned. Also, tanner’s has some HV wire that has ends already crimped on it, they look very similar to spark plug wires, but i believe they are standard silicone HV wire, might be worth a check?
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How is your tub labeled? I will be happy to drop a piece off, and don’t worry about any payment. I will dig around the shop tomorrow and see what I have, as I probably have a couple of different options.
Glad to hear that you found it, let me know if you need a different size or voltage rating. Good luck with your project.