If you have ever had to change a heavily preloaded spring you will appreciate the advantage of these inovative preload rings. These rings greatly reduce the effort and time needed to make spring changes and adjustments after their initial loading. Before jacking up the car, install the retainer rods, then raise the car and easily remove the spring. Install the new spring already preloaded, set the car down and remove the rods. These are a must have on cars using the “big bar / soft spring” package.