An optical disk reading device has a lid having a catch hole provided along an edge, and a locking element having a catch part that removably engages the catch hole, and a push rod directing part. The liquid solidifiable polyurethane composition is the reaction product of COMPONENT A, COMPONENT B and COMPONENT C, as defined herein. A capillary-acting epoxy resin is filled into the assembled housing assembly via a filling-in opening and, on account of its capillary action, closes the interspaces between the semiconductor chip and the housing frame. The tool determines, by one or more computer processors, one or more available additional drivers. The biasing means biases the bearing to be always in contact with at least a portion of an inner peripheral surface of the cylindrical bearing accommodating portion in the other direction different from the direction in which the bearing is displaced in accordance with the varying load.