Abstract: A method for restoring the alignment of the apertures of the upper and lower turrets of a punch press machine includes the steps of determining the radial and angular misalignment, if any, of an individual turret aperture relative to a reference axis such as, for example, the axis of rotation of the turrets. Any angular misalignment of a turret aperture relative to the reference axis is corrected by re-positioning the respective index pin assembly which maintains the turret in a predetermined angular position. Any radial misalignment of the turret aperture is corrected by a re-boring procedure in which a cutting tool supported on a boring bar is advanced through the turret at the area of the respective aperture to re-bore the aperture to a new, enlarged diameter with the walls of the aperture being concentric with an axis at the desired radial spacing from the reference axis.