A method and apparatus of tuning a wind instrument which stabilizes the mating sections of a jointed instrument when the mating sections are pulled out or pushed in during tuning. At least one O-ring is inserted between the mating sections which seals the interface between the sections to create an air tight seal and firm support between sections. The O-rings may have differing thickness, and any number of O-rings may be used. During tuning, the O-rings may be compressed in order to seal the interface between segments when the segments are pulled out or pushed in with respect to each other.