Pivot screw (hinge rod) for the thumb valve lever of many Bach, Conn and Benge instruments. Fits Benge 165F (and likely all other post-1980 Benge trombones), Conn 52H, 56H, 66H, 88H & all variants (88HO, 88HTO etc.), 88HCL, 89H, 62HCL bass, 36H alto, Bach Artisan A47, A47X, A42, A42X, Bach Soloist, and Conn 52J tuba.