Abstract: Applicant has created an apparatus for patching a hole in a wall. The apparatus preferably comprises a multi-section backer plate and a setting or installation tool. The backer plate comprises three rotatably joined sections, together presenting a face that is adhered to an inner wall of the hole, thereby supporting a filler material to fill the hole. The hinges allow the left and right sections to fold forward but not rearward of the planar surface of the middle section. The plate and tool are configured to permit the tool to be selectively joined to the plate at multiple locations along the plate.