TM-9-1240-400-34&P Technical Manual for M109 Telescopes and Mounts Download
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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