Viennese tuning with extension?

[Kevin Sylves]

I just picked up the new urtext edition of the Dittersdorf concerto and I'd like to try it out with viennese tuning. However, I have a C-extension so I can't just use my A string as the 4th string. Do any string companies put out a long F string for viennese tuning with an extension? Does anyone have other ideas? The 4th string needs to be an A with the extension closed at the nut (F with it open)

[bejoyous]

Can you take the extension off somehow and have a luthier carve a little nut?

Or maybe you could drill a hole through the extension's board so the string passes down to the tuning peg.

[Square Bear]

that new edition of dittersdorf has the dopest cadenza. my friend was just working out of that this semester. i hope you find an answer to your question. sorry i can't help.