Nikon NE-101 - Vertical Circle Zero Point Error Checking

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2) Adjustment
(1) Using the supplied hexagonal wrench, turn
the adjustment screws to move the “×” mark
exactly halfway to the center of the reticle
mark, as indicated by Point P in the Fig. [ 2 ]
above.
(2) Repeat Steps (3) ~ (5) of the checking
procedure.