I've had my current tenor for 4 years. Today, by accident, not design, I played with the lyre screw taken out. The different in sound and articulation was huge. Without the lyre screw it was playing like a completely different horn, way better. I've read about nodes, the air column, the effect of heavy mass neck screws etc., which I always thought was snake oil-ish. I did 'with' and 'without' tests. The difference was slapping me in the face. Has anyone else experienced this? I'm now expecting a reply along the lines of ".....you didn't know that? That's the first thing you should do when you play play test a different horn".