an apparatus for rebuilding vehicle axles permits rapid repair at the failure site . the rebuilding apparatus includes a substantially conventional boring machine having specially configured mounting components which facilitate securement of the apparatus to various axle structures . such components include a plurality of mounting plates , one of which is selected to match the bolt circle pattern on a specific axle . the plate is secured to the axle and the boring machine is secured to the plate . vertical and horizontal adjustment devices facilitate accurate alignment of the boring tool with the vehicle axle .