First attempt at posting a help for Riv owners. I installed all new bushings, ball joints, Tie rods and new larger front a rear sway bar recently. I had difficulty figuring how to compress the front spring to get it back in.
Then I saw a hole at the top of the spring cup and the Spring compressor rod just fit in it. So I removed one end of the compressor and effectively compressed the spring into the pocket against the frame. Worked very well. Here are some pics along the way. Fairly self explanatory. I used a chain around the spring and frame just in case it decided to bolt. Can be deadly. I also have the benefit of a lift and jacks etc. Used tie down straps (orange) to guide the spring exactly into the proper position. Remember straps are your friends. Another word of caution for safety. Never stand in front of the spindle. I always stood to the side so if the spring wanted to eject I was not in its path. Well that was the idea anyway. Once installed, I moved to the attachment of the front rod connection to the lower control arm. Again straps are your friend. I needed to pull the arm back to line up the bolt holes. One other lesson. If you install a new sway bar. Make sure you tighten the bolts to the straps before installing the spring. Very difficult to get a wrench on the topside with the spring in the way.
Make sure you torque everything down to spec and install cotter pins. Good luck.