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Here's where things get interesting. Since we had no weight on the frame, we had to improvise on compressing the springs. Using a two-ton strap, the lower hook was attached to the floor jack, and the upper hook to the frame. This puts the tension on the frame we needed to compress the spring. This is about the only way to do it, short of bolting the frame to the floor. If you must do it this way, be careful.