TM 9-2320-209-20-3-2 b. Removal. 1. Using screwdriver, loosen clamp screw (1). Slide turn signal control (2) down on steering column (3). NOTE If truck does not have air brake hand control valve, do not do step 2. 2. Using 5/16-inch allen wrench, loosen two screws (4). Slide air brake hand control valve (5) down on steering column (3). GO TO FRAME 2 15-32