Posted by Daryl Hickman on January 14, 2003 at 13:25:56:
In Reply to: Hexagonal valve springs? posted by Bill on January 14, 2003 at 10:46:25:
I experimented with these in shop on a Besson Compensating Tuba, sometime in the early 90's. I didn't care for them and neither did the customer. DLH