There was a time when there were no DRO's and things were made just as precise as with one. If you start at an edge, and go to the center of 1 hole, and keep your dials turning in the same direction (clockwise), don't zero out the dial every time you punch a hole, and don't crank the dial in reverse without taking out the backlash if you pass your number, you can save yourself some money and be part of the old school that were taught that way.