A post repair kit and method of reparation juxtaposition a lateral brace to a broken section and a new section of a fence post. The kit provides a stake with a proximal end that couples to a hammer mechanism having a reciprocating ram, and a tapered anchor end that drives into the ground. Interchangeable end adapter tools detachably attach to distal end of reciprocating ram. The end adapter tools may include a slotted bit that fits onto a flat stake, where the slot is open sided to allow the tool to fit over stakes that are bent at an edge. Other adapters may engage the stake at alternative points. The hammer mechanism drives the stake into the ground parallel to the post. Fasteners are driven into the stake to secure the stake against the post sections to provide lateral support to the mended junction.