[Walperstyle]

from google

step 1) raise the car off of the ground.
Step 2) unlock the 2 perch nuts from each other
step 3) spin the bottom perch nut to the desired height then measure the bottom of the nut to lowest part of the shock cup.
Step 4) spin the upper perch nut & spring to the lower nut and lock both nuts together.
Step 5) move to the other side of the vehicle and start with step 1 again......