Abstract: A device for and method of repairing damaged openings in wallboard, especially openings for electrical and electronic appliances, comprising a rear flange, front flange and a connecting member to form a channel into which wallboard will fit. The device may be straight or angled into an L shape. The device is inserted into the damaged corner or top or bottom of the opening to provide a solid surface to engage the attachment means on the appliance and can generally be inserted into the damaged opening without complete removal of the appliance or disconnection of wiring.