Abstract: A bridge assembly having a saddle plate with a first aperture, and a tremolo block with a second aperture aligned with the first aperture. A bushing extends through the first and second apertures and is rotatable relative to the tremolo block. The bushing has an internal bore with a longitudinal axis and being substantially concentric with the tremolo block's second aperture. An engagement member extends through the bushing and is partially disposed in the internal bore. A tremolo arm has an engagement section with a partially cylindrical shape and a flat engagement surface that defines a plane substantially parallel to a longitudinal axis of the engagement section. The engagement member is perpendicular to and laterally disposed from the internal bore's longitudinal axis. The engagement member is in frictional engagement with the flat engagement surface when the engagement section is disposed in the internal bore.