Many xerographic machines have a motor polygon assembly, which is a rotating polygonal mirror. The controller performs the beam-to-beam spacing error correction analysis, determining whether or not a correction is necessary, and if so, which optical element to adjust and the magnitude of adjustment. One of the openings of a gas conduit of a valve pin is positioned so that, when the valve pin is in the raised position, the opening is positioned above a second seal ring and, when the valve pin is pushed into a first stop position, the opening is positioned below the second seal ring. Embodiments may have features which increase the device friction with the airway to allow the device to grip the surrounding airway as the device is deployed. The requests can be automatically unblocked after that period of time if the requests do not again meet or exceed the threshold, but can be dynamically blocked for subsequent periods of time if the threshold is again met or exceeded.