TM 9-2320-209-20-3-4 i. Replacement of Flexible Shaft Assembly. FRAME 1 1. Place flexible shaft assembly (1) along top of engine as shown. 2. Put new grommet (2) in hole in firewall (3). NOTE Tachometer end (4) of flexible shaft assembly (1) has square shank. 3. Put tachometer end (4) of flexible shaft assembly (1) through grommet (2) as shown. GO TO FRAME 2 22-11