TMS Kobo Original Acoustic Improvement Neck Screw (Yamaha) ver. 3 Prototype ToneMysterious Screw Commonly known as the Mystery Screw. It doesn't get tight, the sound resonates, and the thickness increases; it's a mysterious screw. After trying various shapes, the shape has been decided so that it can be adjusted to suit the customer. It is made with awareness of sound resonance, sound monitoring, and sound connection. We have received requests for a re-release and are currently considering it, but we will release a portion of the prototypes we have on hand. TMS Acoustic Improvement Screw #Saxophone #Yamaha #Flugelhorn #PiccoloTrumpet #WindInstrument