In a method for controlling a hydraulic power wrench with a pivotable lever pivoted by a piston-cylinder unit and a ratchet arrangement for stepwise rotation of a ratchet bushing by advancing and return strokes, parameters such as nominal torque or pre-load or screw parameters are entered into an electronic input unit. The first principal surfaces of the first and second main wiring plates are adjacent to and parallel to each other except at the locations where the first and second main wiring plates are connected to the semiconductor chip and the locations where the first and second external connection terminals are formed. The optimization process operates by adjusting points of the lattice to extremize a composite function of the spatial coordinates of the lattice points. As a constituent monomer of the copolymer, 0 to 20% by weight of another copolymerizable vinyl monomer may be contained. A potting agent can be used to help secure the component in place within the housing and to help minimize the potential for damage to the component. A filtered replenisher cartridge and method of supplying replenisher with a refilled replenisher cartridge are also disclosed.