take the wheel off obviously with the car in the air.
then the ring that holds the spring in place (under the spring) should have some allen key bolts going through it release them then wind the ring down towards the wheel go for two or three threads at a time make it equal amounts of thread both sides then tighten the grub screws.
^^^ +1
Easiest way to keep track of threads is to make a mark on the ring and count how many times you make a full rotation