Abstract: A plug is used in repairing holes in walls made up of first and second dry wall panels on opposite sides of vertical studs. The plug itself comprises a first body member slidable along a shaft to which a second body member is held on one end. A spring normally biases the body members apart but they can be compressed to a compact configuration for easy insertion in an appropriate cut-out surrounding the hole to be repaired. After the plug bodies have been inserted, the one body is released from its locked position so that the spring will expand the bodies apart. The first body will eclipse the inside of the cut-out in the wall panel to be repaired while the second body seats against the rear surface of the second wall panel to hold the first body in place. Finishing plaster can then cover the front surface of the first body to complete the patching.