Work the cover back down over the core. Fixing Grounded Cord Plugs Most cords with grounding plugs are molded right onto the cord end. However, they can fray and work loose. If this happens, it's best to replace the plug. Cut off the old plug and strip the ends of the wire.
Many cords have an outer sheathing of insulation.
Feed the cord through the plug's back cover and connect the wires. The plug terminals are located in the back. Terminals on the face of replacement plugs covered by a removable cardboard disk are illegal and not a safe choice. The black lead goes around the brass screw. Finally, put the cover over the plug and screw down the cord clamp.