Disclaimer: I have no personal experience with this. You can disregard my posting for that reason alone, as I have nothing of that sort to contribute to your thread.
However, I read your topic with interest and curiosity. One thing that came to mind was the trend (I guess?) to "scoop" out rotors on some tubas. I remember hearing and reading about folks doing this on Cerveny tubas in particular. I do not know the actual measure of the increased bore size that came with scooping out your rotors, but it always struck me as increasing the bore size, but only in a very small way. I do not know what the results were or how widespread the practice really was, but short of full-on frankentuba builds and valve set swaps, this is about all I can think of along these lines.
Thoughts/comments?
Hey, Kids: It's Another Question About Bore Size!
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Re: Hey, Kids: It's Another Question About Bore Size!
The Darling Of The Thirty-Cents-Sharp Low D♭'s.