Abstract: A carburetor with a number of threadedly adjustable fuel/air metering jets, rods or screws is provided with a spring metal flexible retainer clip that surrounds portions of two adjacent metering rods or screws with an interference fit to provide continuous side or lateral compressive forces on the screw threads to prevent backoff of the metering rods or screws during operation of the engine upon which the carburetor is installed due to vibration and temperature changes; the clip consisting of a continuous band of spring steel having reversely bent oppositely located end portions, one portion being formed in the shape of a hook and the other being formed more open to permit the assembly around the pair of adjacent metering rods or screws.