TM 9-1240-400-34&P
5
If necessary, drill and ream a new hole (9) in level
bar (1) and bracket (4) for pin (3). Insert pin using
punch.
CHECKING AND ADJUSTING LEVEL VIALS
1
Check that bubbles are centered within the width of 1
graduation in the elevation (1) and cross-level (2)
vials. If not centered, proceed to adjusting level
vials. Refer to steps 2 thru 5.
2
With the telescope mount level in both directions,
loosen externally threaded rings (3).
3
Adjust two eccentric rings (4), and two eccentrics (5)
using a screwdriver, or fabricated two piece eccentric
tool and screwdriver, and center bubble in cross-
level vial (2) and elevation level vial (1). Refer to TM
9-254.
4
Apply sealing compound (item 10, appx C) to
threads of two externally threaded rings (3).
5
Tighten two externally threaded rings (3).
5-57