A method of producing a printed sheet output of a printing press uses an aqueous solution, an ink, and an input sheet. The barrel portion includes an axial passage defined by a wall, the wall having an exterior surface defining an outer periphery having a substantially circular shape. The relative distance between the first lens group and the second lens group is controlled by the leading cam. The flow cell assembly can also be used in a completion program to assist in the steering of a lateral well being drilled below the target formation. Air sealing is provided between the compartment and the door panels.