Original poster: "dave pierson" <davep-at-quik-dot-com>
I'm Assuming adjustability is desired?
Random, untested, thought:
Smallish Stainless Steel Hose clamp?
Seems it would be:
adjustable?
Uniform inward radial force applied?
(minimizing tube crushing...)
Some Stainless can be soldered to, with care, and the right flux...
best
dwp