A dresser for dressing a grind stone including two concentric solid wheel dressing elements. The concentration of the hydrophobic monomer may be 14 to 25% by weight based on the combined weight of the hydrophobic monomer and the hydrophilic monomer. A first transistor is configured to have its gate node connected to an input node for receiving the input signal and its drain node connected to an input node of an output stage. In addition, the rigid arms cause the trim panel to move in a controlled arc. The routed switch connects each input terminal to at least one output terminal or none of the output terminals according to a control signal.