visualize an analog clock showing 5 minutes before 5 o'clock and if you epoxied the hands to lock the hour and the minute hand together as one then rotated the hand assy 1/2 turn (180 deg) the offset would end up being the same and if you 1st changed the roll pin hole and if this put the hands at 10 minutes in front of 4 and you locked them together as before and again swapped them 180 the top hand would still be 10 minutes away from (12)