Posted by Art on October 31, 2000 at 23:43:48:
In Reply to: Rotary springs--clockspring or wire posted by Chuck on October 31, 2000 at 15:53:07:
I have a very old Brand X tuba (I think it's Czech) with clockspring rotors which have a ratchet mechanism for adjusting the spring tension. They work perfectly even on this ancient, beat-up horn. I can't imagine any modern manufacturer spending the time to build such neat devices.