Once the upper retainer is in place all you need to do is slide the spring over the shock and screw on the lower spring cup/retainer/spanner. Once you have the bottom spanner at the spot where you would like it this little set screw keeps the spanner in place. The screw uses a 4mm allen wrench to tighten.
You want to start the intsall process with the bottom spanner just touching the springs so that they wont fall out of the upper spring cup/retainer. This gives the spring 0 preload and is the ideal spot to start at.
