During off-peak operation of a power plant operating on a thermodynamic cycle wherein heat is rejected to an ambient fluid, heat is removed from a cold temperature storage medium. The light source projects a light beam. An open hole is formed on a bottom of the base, and the base includes a fixing portion. , urethane or polyurethane, to substantially cover both the exposed surface of the base and an inner surface of the cavity, depositing a cushion material into the cavity and sealing the cavity with the exposed surface of the base so that the coating material forms a skin around the cushion material and adheres the cushion material to the base. A first section of the coin chute is in communication with the coin slot. Also, a defect produced from respective sheets is minimized to enhance the yield.