A fastening tool includes a nut having a short side that is shorter than a width of an opening portion, and a long side that is longer than the width of the opening portion, and at a mounting position in which the short side corresponds to a short side of the base portion, the nut is inserted into a hollow portion inside a structure. The process comprises carrying out the electrolysis in the presence of a co-electrolyte and an alkali metal halide. The server then uses the temporary local directory number to reach a data unit on the network, which is used to place a local call over the public switched telephone network to the serving switch.