The invention relates to a method and apparatus for returning the oil drained from a working pressure space of a hydraulic motor into a motor casing to an oil line, which is connected to the motor and which is in communication via a divider with intra-motor flow channels which are in communication with the working pressure spaces. An arm of the frame includes a spring bar extending from the arm and bearing against the temple piece. The counting unit counts contact portions between the circumscribed figure extracted by the extraction unit and the pixel block. The latch stop is spaced from the stop member by a jack nominal dimension within a jack tolerance. A cam disc is pivotably supported on the mirror base about a second pivot axis, wherein the mirror head has a support and wherein the tension spring has a first end connected to the cam disc and a second end connected to the support.