The removal of ceramic material from the interior of cast metallic components is accomplished in a closed system. Hereby, the carrier defines a movable optical path relative to the remaining, stationary optical path. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way. Conversely, the lower surface of the frame is defined by the roller arms which are not connected to one another. The tail boom saddle comprises upper and lower saddle portions adapted to exert clamping forces against the tail boom outer skin.