TM-9-1290-262-24&P Technical Manual for M2A2 Aiming Circle Download
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10 If circular level bubble does not stay cen- tered, eliminate half the error by adjusting either of two setscrews (9) and eliminate remaining error by adjusting the knob as- semblies (4). 11 Return aiming circle to zero using azimuth knob (7). Circular level vial bubble should remain centered. If not, repeat steps 7 thru 10 until circular level vial bubble stays centered. 12 NOTE In steps 12 thru 21 below, tube level vial will be referred to as azimuth level vial. Using azimuth knob (7), turn aiming circle in four settings of 1600-mil increments. Azimuth level vial (10) bubble should re- main centered at each position. If it re- mains centered, proceed to eyepiece focus adjustment. Refer to page 4-23. If the azimuth level vial (10) bubble does not re- main centered, proceed to step 13. ARMY TM 9-1290-262-24&P MARINE CORPS TM 00476C-24&P AIR FORCE TO 49 A7-3-72/74 4-21