I have this late model Martin / Yanagisawa stencil curved soprano. Plays great. Even so, I've tended to play one of my straight soprano because I prefer the freer blowing feel and playing posture. The other day I realized that my slightly curved neck from by Yanagisawa 991 fit perfectly on the curved soprano. That 991 has two neck pipes. I've tended to use the straight one on the 991. This slightly curved neck was relatively unused. Much straigher than the curved neck on the curved soprano, however. I added a little cork to the lever that lifts the octave key and it operated the octave key very nicely. To my surprise my curved soprano played great and in tune. Plus, it had that free blowing feel I like on the straight soprano. I still have that tipped bell sound presence that is really nice in a louder setting and the somewhat more 'saxophoney' sound of the curved horn remains. I even liked the horn/mouthpiece playing posture better than with the original curved neck pipe. Has anyone else done this?