TubeNet

Think Hirsbrunner (or Yamaha 641?) tubing for an old-school “2nd+3rd” 5th valve extension project.
Some portion as matched/telescoping set(s) of inside/outside preferred, but not essential.
Lacquer/plating not important
Also interested in similar bore 2ndV and/or 1stV bows
Spare HB6 HB-6 main tuning slide parts are interesting, too.. whatchyagot?

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Thanks!