TM 10-6640-238-13 3-20 3-7. ANEROID BAROMETER. This task consists of: a. Remove b. Install INITIAL SET-UP Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 1) Materials/Parts Required Lockwashers, (3) REMOVE Remove Aneroid Barometer.  See Figure 3-4. a. Remove three screws (1), lockwashers (2) and carefully remove aneroid barometer (3) from wall.  Discard lockwashers. b. Loosen two retaining ring clamp screws (4). c. Remove retaining ring (5) from barometer (3) and mounting cushion (6). d. Remove barometer (3) from mounting cushion (6).  Retain cushion for installation. INSTALL Install Aneroid Barometer.  See Figure 3-4. a. Install mounting cushion (6) on aneroid barometer (3) and insert into retaining ring (5). b. Tighten two retaining ring clamp screws (4) until aneroid barometer (3) is held securely in place. c. Install aneroid barometer (3) in place on wall and secure with three screws (1) and lockwashers (2).