An apparatus comprising: a power boost package configured as an attachable module for use with a spring-damper door actuator to move a door, including a chassis and having a portion configured to be in power communication with the spring-damper door actuator for movement of the door, the chassis of the power boost package forming a structure to retain: an actuation member structured to contribute a power in the movement of the door, and including a first eccentric surface and a second eccentric surface , each capable of rotating about an axis; and an energy storage device capable of being energized by movement of the actuation member, the energy storage device operable to store a boost energy as a result of a first movement of the actuation member, and configured to release the boost energy at a release position of the actuation member, the boost energy released through the actuation member as a result of a second movement of the actuation member; a first reaction member and a second reaction member configured to be in contact with the actuation member , the first reaction member configured to energize the energy storage device as a result of the first movement of the actuation member, the second reaction member configured to receive the boost energy from the energy storage device as a result of the second movement of the actuation member; wherein the first reaction member and the second reaction member are in the form of cam followers to the first eccentric surface and the second eccentric surface , respectively; wherein the apparatus further comprises a latch and a catch , the latch being receivable by the catch to couple the first reaction member and second reaction member to have sympathetic movement during the second movement, and permit independent movement of the first reaction member and second reaction member during the first movement; and wherein the first reaction member and the second reaction member are slidingly received in the chassis. an actuation member structured to contribute a power in the movement of the door, and including a first eccentric surface and a second eccentric surface , each capable of rotating about an axis; and an energy storage device capable of being energized by movement of the actuation member, the energy storage device operable to store a boost energy as a result of a first movement of the actuation member, and configured to release the boost energy at a release position of the actuation member, the boost energy released through the actuation member as a result of a second movement of the actuation member; a first reaction member and a second reaction member configured to be in contact with the actuation member , the first reaction member configured to energize the energy storage device as a result of the first movement of the actuation member, the second reaction member configured to receive the boost energy from the energy storage device as a result of the second movement of the actuation member; wherein the first reaction member and the second reaction member are in the form of cam followers to the first eccentric surface and the second eccentric surface , respectively; wherein the apparatus further comprises a latch and a catch , the latch being receivable by the catch to couple the first reaction member and second reaction member to have sympathetic movement during the second movement, and permit independent movement of the first reaction member and second reaction member during the first movement; and wherein the first reaction member and the second reaction member are slidingly received in the chassis. <EOS>