TM 10-6640-238-13 4-176 4-72.    GAS ALARM KIT, SAMPLING KIT, FLASHPOINT TESTER, AND BRACKETS. This task consists of: a. Remove b. Install INITIAL SET-UP Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 1) Portable Electric Drill, (Appendix B, Section III, Item 2) Twist Drill Set, (Appendix B, Section III, Item 2) Hand Blind Riveter, (Appendix B, Section III, Item 3) Materials/Parts Required Rivets, (20) REMOVE 1. Remove Gas Alarm Kit and Bracket.  See Figure 4-68. a. Open cabinet D to gain access to hardware. b. Loosen strap (1) and remove gas alarm kit (2). c. Lift up lever on three snap fasteners (3) and remove cylinder holder (4). d. Remove two screws (5) and plate (6). e. Remove four rivets (7), two brackets (8), with strap (1). f. Remove six rivets (9) and three snap fasteners (3). 2.     Remove Sampling Kit, Flashpoint Tester and Brackets. a. Open cabinet D to gain access to hardware. b. Loosen strap (10) and remove sampling kit (11). c. Loosen strap (12) and remove flashpoint tester (13). d. Remove three rivets (14) and bracket (15). e. Remove two rivets (16) and strap (10). f. Remove three rivets (17) and bracket (18). g. Remove two rivets (19) and strap (12). INSTALL 1. Install Gas Alarm Kit and Bracket.  See Figure 4-68. a. Install three snap fasteners (3) and secure each with two rivets (9). b. Install strap (1), with brackets (8) and secure each with two rivets (7). c. Install plate (6) and secure with two screws (5). d. Install cylinder holder (4) and secure by lowering snap fastener (3). e. Install gas alarm kit (2) and tighten strap (1).