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We installed a proven design of pull bar that is manufactured by Bert and offered by All Star Performance. This unit has two springs, a 2,500 pound spring stacked with a 3,500 pound spring. Together they are a rate of 1,458 pounds and when the smaller 2,500 pound spring is used up and in coil bind, the rate goes to the 3,500 pound rate of the larger spring. The unit also has a hydraulic cylinder and piston with an adjustable reservoir that is used to preload the springs to adjust to the track conditions.