Automotive machine shop services use heavy fabrication machinery, which includes machines for lathe work, grinding, turning, polishing and welding, cutting, laser job work, and also precision machining. The services include providing repair work for defective parts and also supplying new parts if the old and existing parts are not repairable. If the new parts, available in their stocks, do not fit properly, they may have to redesign and refabricate them. This may, at times, prove to be a complicated job. The redesigning and fabrication of complicated parts like crank-shafts, connecting rods, pistons, and cam shafts requires great expertise. Usually, the need to fabricate new parts arises in the case of older or vintage vehicles, whose production may have been stopped with the introduction of new models.