Abstract: A retainer apparatus and method for replacing a damaged first aperture thread in a base material, the apparatus includes a first annular element having a threaded inner surface and a frictional outer surface that are co-axial to one another, the outer surface having a slip fit with a second aperture in the base material. Also included is a second annular element including a void and a frictional outer periphery that has a slip fit with the second aperture, the second annular element includes a channel from the void to the outer periphery. The first and second annular elements are adjacent to one another within the second aperture. Further included is a drive element that has a partial interference fit with the channel, wherein the drive element is operational to drive the outer periphery into the second aperture thereby retaining the first annular element in the second aperture.