To do this, it will be enough to purchase a sheet of fiberboard. It must be adjusted by size, first noting and cutting the places of the door eye and locks. Having adjusted the new casing in size, it must be screwed to the door. A screwdriver and a couple of dozens of self -tapping screws will perfectly cope with this task. As soon as the panel is installed, it should be grinded at the edges with sandpaper.