A system, in certain embodiments, includes a housing running tool including an inner sleeve having a first mating surface configured to engage a second mating surface of a housing to rigidly couple the inner sleeve to the housing. In one embodiment, the locking mechanisms for security cabinets provide a visual indication of whether the security cabinet is locked or unlocked. The user interface may include a control for specifying a data source and a data field to which the parameter should be bound. Therefore, a bidirectional switching element can be realized by use of one MOSFET. Also included is a method for controlling spending. The image forming apparatus of the present invention includes a plurality of light emitting heads having rod lens arrays which focus imaging rays on photosensitive members and have different modulation transfer functions, thereby being capable of providing a high quality image at a low cost while preventing optical density unevenness from being produced in the image.