A method of assembling a torque motor, comprising: fastening the torque motor to a support such that any magnetic elements (110,112,114) of the torque motor are substantially fixed in position with respect to the support, but without securing an armature to the torque motor, wherein the armature comprises an aperture, wherein the aperture comprises an inner circumferential surface configured to mate with an outer surface of a fixed element of the torque motor; locating the armature of the torque motor around the fixed element of the torque motor such that the armature is able to move with respect to the fixed element; moving the armature with respect to the fixed element whilst the magnetic elements (110,112,114) of the torque motor are substantially fixed in position with respect to the support, so as to position the armature in an in use orientation or position; and then attaching the armature to the fixed element in the in use orientation or position; wherein during the moving step the fixed element permits rotational movement of the armature relative thereto about one or more axes (X, Y, Z), whilst substantially restricting movement of the armature in a direction along a longitudinal axis of said armature once the armature is located around the fixed element; and either: during the locating step the armature is rotated about the longitudinal axis of the armature; or the fixed element comprises a transverse axis, and during the locating step the armature is rotated about the transverse axis of the fixed element; characterised in that: the fixed element has a spherical profile over the outer surface. fastening the torque motor to a support such that any magnetic elements (110,112,114) of the torque motor are substantially fixed in position with respect to the support, but without securing an armature to the torque motor, wherein the armature comprises an aperture, wherein the aperture comprises an inner circumferential surface configured to mate with an outer surface of a fixed element of the torque motor; locating the armature of the torque motor around the fixed element of the torque motor such that the armature is able to move with respect to the fixed element; moving the armature with respect to the fixed element whilst the magnetic elements (110,112,114) of the torque motor are substantially fixed in position with respect to the support, so as to position the armature in an in use orientation or position; and then attaching the armature to the fixed element in the in use orientation or position; wherein during the moving step the fixed element permits rotational movement of the armature relative thereto about one or more axes (X, Y, Z), whilst substantially restricting movement of the armature in a direction along a longitudinal axis of said armature once the armature is located around the fixed element; and either: during the locating step the armature is rotated about the longitudinal axis of the armature; or the fixed element comprises a transverse axis, and during the locating step the armature is rotated about the transverse axis of the fixed element; during the locating step the armature is rotated about the longitudinal axis of the armature; or the fixed element comprises a transverse axis, and during the locating step the armature is rotated about the transverse axis of the fixed element;