A method and apparatus for accurately slitting a rod into two equal sections in which the rod is longitudinally advanced to a slitter and is laterally shifted by an in-line guide adjustment system or 1GA so that the slit sections will be equal. The rod sections are measured by the 1GA after slitting to evaluate any difference in size therebetween while the sections are advancing, and the 1GA transversely shifts the rod before it enters the slitter to eliminate any size differential between the slit sections.