METHOD 2 (Cont.)
 Is Left Side equal, longer,
 or Shorter than Right Side?
 FSD < NSD or FSD > NSD
1)  Measure Offset
2)  Measure NSD
3)  Calculate FSD:
    FSD = NSD - Offset
               or
    FSD = NSD + Offset
4)  Measure FSD and
    mark Position.
5)  Adjust FBA
    until Laser Beam
    meets FSD position.