Subtract the adjustment to get the final desired height. Using the file, slowly remove metal from the top of the sight post. Keep the top square as viewed from the rear, and create a slight slope from rear to front. Work slowly, avoiding contact with the wings on either side. For best results solidly anchor the rifle in a cleaning cradle while filing.
Measure progress frequently.
When close to final calculated height, fire more groups and fine tune a few light strokes at a time. It is better to finish with the front sight a bit too tall than too short. When done refinish the raw surface with cold bluing. Now to the windage. Center the rear sight by cranking the windage knob until the single indicator notch on the moveable sight base is aligned with the long notch in the center of the row of notches on the receiver.