Abstract: A mirror assembly is provided adapted for use with a vehicle and includes a mirror housing, a mirror, a support bracket for mounting the mirror housing on an associated vehicle and an expandable ball and socket arrangement associated with the mirror housing and support bracket for selectively retaining the mirror in a desired rotational position relative to the vehicle. The ball and socket arrangement comprises a partially spherical socket formed in the mirror housing, a thin-walled socket liner retained therein and an expandable ball securely connected to the mounting bracket. The expandable ball comprises a plurality of partially spherical segments each attached to a shank and resiliently deformable outwardly from an axial bore therethrough. A draw bolt is received in the axial bore and when drawn therethrough, engages the spherical segments biasing same outwardly to resistably engage the socket liner.