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I am having problems with my octave key (the one at the top of the main body tube). When I release the G key (with the octave key depressed), the neck octave key opens fine, but the "other" octave key does not close all the way. When I force it closed, the quality of the upper register improves dramatically. I think the spring on the G key linkage is not strong enough to completely close the "other" octave key. The horn is only a couple years old, but I have been having problems with the horn since I bought it, and, the upper and lower registers have never really been in tune with each other. Is there an adjustment, is there more than (just) one spring, is there a stronger spring I can put on to make the key(s) close all the way? HELP!!!!!