Abstract: An existing pitching machine is retrofitted to realize the capability to deliver a variety of pitches, including change-up pitches. A retrofit kit includes an add-on plate that is bolted to a casting that is attached to a stand. A ball screw actuator is connected on one end to a compression plate assembly on the existing pitching machine and on the other end to the add-on plate. A control box has a plurality of speed and potentiometers. These potentiometers are used to move the pitching machine to a preset speed and angle combination. In some embodiments, a handheld control unit has buttons associated with preset speed and angle combinations.