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The torsion springs are utilized on the front and center link arms only. The rear link arm does not require a spring. The torsion spring is fit over the carburetor shaft. The hooked end goes around the link arm and the other end rests against the carburetor base. The link arms are set at approximately a 40-degree forward angle from the vertical. This should apply enough tension on the spring to snap the carburetor shut from the open position. Caution must be taken to not overtighten the screws. Once fully tightened, the torsion spring should keep the throttle shut against the stop screw on the opposite side of the carburetor.