TM 9-2350-261-107. Loosen clamping screw andadjust headrest.8. Turn periscope to the right orleft, as needed, and tightenazimuth locking knob.9. Adjust periscope in elevation andtighten locking lever.NOTESome M19 periscopes haveadjustingscrew tofocuseyepiece. Others have automaticfocusing. Both are shown below.10. Focus eyepiece with right andleft adjusting screws.2-210
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