The high pressure manufacturing process for making a polyolefin is improved by using as a lubricant for the hypercompressors used in the process to assist in the generation of the high pressure a polyether polyol comprising no more than one hydroxyl functionality. The turntable is located on the chassis for rotating an optical disk positioned thereon. The seal structure includes a base portion elongated along and attached to a peripheral edge of the frame member or the vehicle body, and a flexible contact portion extending integrally from the base portion and configured for sealing communication with an opposing surface. The method may include receiving, from the second computing device, identification data associated with the second user.