k. Locate the Jam nuts on the cross arm spirit level.
(See Figure 12.)
Rotating the leveling jacks CW/CCW will cause the air bubble
to move left or right of the center. To bring the air bubble
toward the center, lower the leveling jack that is closest to
the air bubble, or raise the leveling jack farthest from the
air bubble. Figure 12 shows the cross arm spirit level at a
You can also bring the air bubble closer to the center.
Loosen the two jam nuts on the high side.
Lower the spirit
level until the air bubble is centered. Secure the jam nuts
against the spirit level.
The jam nuts on the low side may
also be loosened. The spirit level should be raised until the
air bubble indicates a level condition. Then, secure the jam
nuts (Figure 12).
Cross arm spirit level.