An improved switch consists of a seat, a button key, a first elastic element, a second elastic element, and a cap. The carrier attaches in such a way that it is difficult to remove when the manufactured good is closed, or operational, but can be removed with or without the use of a tool when the manufactured good is opened for service. The method also includes computing an output based on the DFT matrix and applying the output to an event processor. The middle floor also forms an anchor member from which equipment for suspending can be suspended, which equipment is accessible from outside the fuselage through said open bottom. The device has the corresponding components for implementing the method. The sealing bodies are constructed as rollers which, provided with an installation play, are received in the recesses.