Drive mechanism (100, 200) for an external rear view device to be fitted to a motor vehicle, the mechanism comprising: a vehicle mountable frame base (110, 210); a frame arm (120, 220) for accommodating the external rear view device, rotatable with respect to the frame base (110, 210) about a first axis; a drive coupling (140, 240) rotatable with respect to the frame base (110, 210) about a second axis; and a drive shaft (150, 250), - operably connected to the drive coupling (140, 240) by a first connection, wherein the first connection comprises a pair of drive dogs (143, 253) configured to locate within a pair of recesses or slots (153, 242) shaped to receive the drive dogs (143, 253), wherein rotational drive is transferable between the drive dogs (143, 253) and the recesses or slots (153, 242), and - operably connected to the frame arm (120, 220) by a second connection, wherein the second connection comprises a clutch coupling (160, 260), which transfers rotational drive between the drive shaft (150, 250) and the frame arm (120, 220), where the second connection further comprises a pair of drive dogs (154, 254) configured to locate within a pair of recesses or slots (163, 263) shaped to receive the drive dogs (154, 254), wherein rotational drive is transferable between the drive dogs (154, 254) and the recesses or slots (163,263) such that the drive shaft (150, 250) is capable of transferring rotational movement from the drive coupling (140, 240) to the frame arm (120, 220) allowing for rotational movement, where the drive coupling, clutch coupling and frame arm do not share a common axis of rotation, wherein the frame arm (120, 220) and drive shaft (150, 250) are movable such that the first axis and second axis are movable with respect to each other. a vehicle mountable frame base (110, 210); a frame arm (120, 220) for accommodating the external rear view device, rotatable with respect to the frame base (110, 210) about a first axis; a drive coupling (140, 240) rotatable with respect to the frame base (110, 210) about a second axis; and a drive shaft (150, 250), - operably connected to the drive coupling (140, 240) by a first connection, wherein the first connection comprises a pair of drive dogs (143, 253) configured to locate within a pair of recesses or slots (153, 242) shaped to receive the drive dogs (143, 253), wherein rotational drive is transferable between the drive dogs (143, 253) and the recesses or slots (153, 242), and - operably connected to the frame arm (120, 220) by a second connection, wherein the second connection comprises a clutch coupling (160, 260), which transfers rotational drive between the drive shaft (150, 250) and the frame arm (120, 220), where the second connection further comprises a pair of drive dogs (154, 254) configured to locate within a pair of recesses or slots (163, 263) shaped to receive the drive dogs (154, 254), wherein rotational drive is transferable between the drive dogs (154, 254) and the recesses or slots (163,263) - operably connected to the drive coupling (140, 240) by a first connection, wherein the first connection comprises a pair of drive dogs (143, 253) configured to locate within a pair of recesses or slots (153, 242) shaped to receive the drive dogs (143, 253), wherein rotational drive is transferable between the drive dogs (143, 253) and the recesses or slots (153, 242), and - operably connected to the frame arm (120, 220) by a second connection, wherein the second connection comprises a clutch coupling (160, 260), which transfers rotational drive between the drive shaft (150, 250) and the frame arm (120, 220), where the second connection further comprises a pair of drive dogs (154, 254) configured to locate within a pair of recesses or slots (163, 263) shaped to receive the drive dogs (154, 254), wherein rotational drive is transferable between the drive dogs (154, 254) and the recesses or slots (163,263) such that the drive shaft (150, 250) is capable of transferring rotational movement from the drive coupling (140, 240) to the frame arm (120, 220) allowing for rotational movement, where the drive coupling, clutch coupling and frame arm do not share a common axis of rotation, wherein the frame arm (120, 220) and drive shaft (150, 250) are movable such that the first axis and second axis are movable with respect to each other.