A ventilation pathway for a cooling gas to flow extends on a radial axis in a generator stator core. A knob shaft, rotatable by way of a knob, is mounted to rotate on one side or both sides of the lock cylinder. Each disk has a cutting edge and the slitting mechanism can either enter or not enter a path followed by a web of media such as wallpaper media, according to a requirement of an operator. A third level construct comprises regions for data, identifies the region in terms specific to the format and to the sectors.