A cathode system includes an impregnated pellet and a conductive cup, which has substantially cylindrical sides. Each valve can be individually operated so that specific zones of suction cups may be activated while others are dormant. A first ball lens and second ball lens are located in the optical pathway, with an optical link gap located the first and second ball lenses. The pressure channels may be coupled to a hot-air reservoir by a control device, lines and valves, and the suction channels may be coupled to a vacuum reservoir, unless a short-circuit valve is used to cross connect the lines. A user can debug the system, checking how many objects are assigned to the third memory category, and how many objects assigned to the third memory category are not accessed after initial allocation. The bearing member comprises an inner peripheral surface for receiving a hub spindle therein, a bearing surface for engaging a bearing, and an interlock portion.