The present invention is directed to a semi-rotating valve assembly that may be used in conjunction with an internal combustion engine. A disk shipping system and method for shipping disks allows stocking a minimal number of components while still allowing packaging and shipment of different thickness of disks and different capacities of disks in a container. An output of the receiver is analyzed to determine if the receiver can accurately pass the signal pattern at each reference voltage level. A computing unit simultaneously provides, in a single processing, values of \u03c4 to the digital interpolator and values of the equalization parameters e to the digital equalizer. The buyer goes to the store and while being monitored by an agent or employee of the service, the buyer inspects the merchandise. In one embodiment, the paddles are flexible along their height so that a portion of the paddle can flex to rotate under the force of a securing structure.