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The rubber biscuit has been around for some 10 years now and has shown to be of use if the pre-load is set fairly high. If not, the 1/4-inch plus of movement is way too much rear steer. This apparatus can be used on the right side of dirt cars with the spear rod attaches to develop rear steer that will straighten the rear end more toward square on acceleration off the corners. Dirt cars usually utilize rear steer to the right for entry and mid-turn efficiency, but need a more straight ahead position for the rear end when coming off the corners.