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The headjoint stopper of claim 2 wherein said deformable sealing member is a ring-like neoprene member and is disposed on said stem.Ĥ. The headjoint stopper of claim 1 wherein said bottom disc member includes an integral threaded stem and said compressing means includes a washer disposed on said stem and a nut threadedly received by said stem.ģ. Means for compressing said deformable sealing member against said back side whereby the thickness of said deformable sealing member is decreased while the perimeter length of said deformable sealing member is increased.Ģ. A headjoint stopper for the headjoint of a flute, said headjoint stopper comprising:Ī bottom disc member having a concave embouchure-hole-facing side and a back side and having an external configuration sized to fit the inside of said headjoint with metal-to-metal contact around the entire circumference of said bottom disc member providing a seal between said headjoint and disc Ī deformable sealing member positioned against said back side and This increase in peripheral length causes the sealing member to expand against the inside diameter of the headjoint irrespective of any out-of-round condition and thereby forms an air-tight seal.ġ. With the headjoint stopper properly positioned within the headjoint relative to the embouchure hole, the advancement of the hex nut causes the thickness of the sealing member to decrease which results in a corresponding increase in peripheral length. The externally threaded stem is integral with the bottom disc such that as the hex nut is advanced along the stem toward the bottom disc, the clamping washer is forced against the sealing member and the sealing member is thereby compressed between the bottom disc and the clamping washer. The bottom disc member has an external configuration sized to fit the inside of the headjoint with metal-to-metal contact around the entire circumference of the bottom disc member.

A headjoint stopper for the headjoint of a flute includes a concave bottom disc member having an externally threaded stem axially extending from the back side, a deformable, ring-like sealing member positioned against the back side of the bottom disc, a clamping washing and a hex nut threadedly received on the externally threaded stem.