Measure distance from head assembly (4) to
mark on wall in inches (centimeters).
Multiply distance in step 6 by 0.30350 (tangent of
Place tape (5) (item 14, appx C), above and
below mark, at distance determined in step 7.
Rotate elevation knob (6) from stop-to-stop.
Reticle must follow plumbline within 0.5 mil. Line
of sight must elevate, or depress, no less than
If plumb travel is not within limits, replace prism
If line of sight travel is not within limits, adjust
ELEVATION MECHANISM BACKLASH
Aline reticles by turning elevation knob (1),
clockwise, without overtravel.
If not, loosen three screws (3) and turn
Tighten three screws.
Rotate elevation knob (1), counterclockwise, at
least a half turn, and return clockwise with no
overtravel to aline index to zero.
If reticles are not within 5.0 mils, adjust head