Pentz:  (In regard to 1902 sight windage adjustment).

  From my experience, there is a lot of slop and 'backlash' in this adjustment on a 1902 rear sight.  It does not turn smoothly like a fine target sight.  On the other hand, it works.  It allows windage adjustment and holds its setting.  Get things close and then concentrate on sight picture and centering of shot group.  I see a lot of shooters who fiddle too much with fine adjusting their sights.  They end up frustrated because they have not allowed things to stabilize and get into a shooting rhythm.  IMHO