Disclosed is an apparatus and method for modeling and estimating the characteristics of a power amplifier with memory. The cover includes at least as flap. A method of transporting cut sheets in a printing system forms a nip between at least one pair of cylinders, each cylinder having an array of contact points, guides a first edge of a cut sheet into the nip, and uses the arrays of contact points to transport the cut sheets through one of either a fusing or drying process. The pair of inner arms is symmetrically disposed about the first cam arm to prevent lateral displacement of the cam.