Abstract: A lay shaft repair kit and a method for its use is set forth wherein a lay shaft is utilized in a fuel injector control linkage and provides for the removal of a forward portion of the shaft, its replacement, and its splicing to the original lay shaft portion utilizing a rectangular parallelepiped splicing block formed with a through-extending cylindrical bore therethrough offset relative to the forward and rear end walls of the block. A slot is directed diametrically aligned and medially through the right side wall of the block. A series of threaded apertures are aligned orthogonally through the slot to effect a pinching of the slot about the original and replacement shaft portions. The original and replacement shaft portions are formed with through-extending bores and aligned with through-extending block bores to receive interlocking pins therethrough to secure the shaft portions to the splicing block to effect a repair of the lay shaft.