2. Referring to the lines and figures scribed on the throttle plates and throttle body during disassembly, install the two throttle plates, using four new throttle plate screws. Install the four throttle plate screws snugly but do not tighten them. Check to be sure no binding is present when the throttle shaft is rotated. With the throttle plates closed, hold the throttle body up to the light. Little or no light should show between the throttle plates and the throttle bores of the carburetor. When the throttle plates are properly aligned, tighten the four throttle plate screws and stake them to prevent loosening. Use any approved carburetor staking tool. If it is necessary to use an impact type of staking tool, be sure to back up the heads of the throttle plate screws to prevent bending the throttle shaft when staking screws.