When plumbing hard lines for various applications, I've always included a 360 degree vibration loop somewhere in the line if possible. Bending the line all the way around a big socket (1 1/4" or so) clamped in a vise makes a good looking vibration loop without collapsing the tubing.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!