Abstract: An apparatus for anchoring fasteners includes a shaft, a guide disk and a flange. The shaft extends in an axial direction between a proximal end and a distal end. The shaft has an internally threaded axial bore, and at least one outer surface thread. The guide disk is disposed at the distal end of, and coaxially with, the shaft. The first disk has a first diameter that is less than a major diameter of the at least one outer surface thread, and greater than a minor diameter of the at least one outer surface thread. The flange is disposed at the proximal end of the shaft, and has a width exceeding the first diameter. The flange includes a drive feature configured to engage a drive tool.