Telescoping 20mm ID brass tubing

[roweenie]

Hey everybody -

I'm still looking for a source for telescoping brass tubing (no nickel silver) where the inside tube has an ID of 20mm/.787 (think 4th valve of horns and small end of the MTS with .748/19mm through the first 3 valves).

At present I need just a foot of each, but will need much more in the future.....

[roweenie]

Thanks, bloke, for all those suggestions - that may be the ultimate route I'll go - - - -

When Meinl-Weston sells a lacquered tuba (not silver plated), are the slides nickel silver, or are they brass? It just seems odd to me that this tubing is unavailable anywhere on this planet......