The finished GFCI receptacle installation using Madison Bars to support the box. I usually prefer to install the box next to a wall stud so that a wood or sheet metal screw can be screwed through a hole in the box directly into the wood stud in addition to the Madison Bars. That makes the box extremely secure. However in this case the customer wanted the receptacle installed in this exact location.
Home Electrical Receptacle Box Installation in an Existing Wall Using Madison Bars GFIWallOutlet-Copyright-IMG_1151-460x613