ARMY TM 5-5420-212-10-1
MARINE CORPS TM 08676A-10/1-1
Clean levelling screw and swivel mount threads with oil soaked cloth, then dry with a clean, dry cloth.
Apply light coat of grease to threads of levelling screw.
Install levelling screw (1) in swivel mount (2).
Check that screw tums freely throughout its length.