It is just as likely that the linkage form the F# key to G# or to Bb is incorrect, not allowing the F# to close.
BTW, I regard the stack key (F#/F/E/D) adjusting screw's purpose to be mainly for getting the F# arm to rest simultaneously on all three key feet (of F/E/D keys), and for making only VERY small linkage adjustments. Otherwise you introduce "double action". I have reason to believe that this is Yamaha's attitude too.
The entire Bb/G#/F# area of a sax is by far the most difficult to get right. I don't really recommend messing with it yourself unless you regard yourself as being at lease as competent as your local technician. It's could be compared to adjusting the carburettor of a modern car. IMO most DIY guys who attempt it have no idea of how much they don't know.
BTW, I regard the stack key (F#/F/E/D) adjusting screw's purpose to be mainly for getting the F# arm to rest simultaneously on all three key feet (of F/E/D keys), and for making only VERY small linkage adjustments. Otherwise you introduce "double action". I have reason to believe that this is Yamaha's attitude too.
The entire Bb/G#/F# area of a sax is by far the most difficult to get right. I don't really recommend messing with it yourself unless you regard yourself as being at lease as competent as your local technician. It's could be compared to adjusting the carburettor of a modern car. IMO most DIY guys who attempt it have no idea of how much they don't know.
