How to remove Matsumoto electrician switch socket?

Matsumoto electrician switch socket adopts traditional structure, but it can be removed by unscrewing the screw.

Another style Matsumoto

There is a gap on the left and right (see the position of the arrow in the figure). Insert a crew cut screwdriver and rotate it 90 degrees to lower the panel and expose the mounting hole, and then install it (screw on the mounting screw and cover the panel).

If the disassembly continues, remove the four buckles, the five-hole cover plate, the four fixing screws and the socket body, and finally only the mounting frame is left.