The driven pulley comprises a first sheave and a second sheave coaxially mounted around a main shaft. The operating system emulator can be configured to track and determine the energy consumption of hardware components by using predefined energy utilization specifications. The X-ray source and the X-ray detector are rotatable together around an axis of rotation. The first and second caps are adapted to cover at least a portion of the entrance ports of respective first and second arms of the plurality of arms. An upper mold is mounted on the lower mold, and melted molding resin is filled in a space between the lower molding and the upper molding.