If you have the Koni 82-1701 & 82-1601 you have to:
1 - Remove the spring.
2 - Remove the upper eye by remove the lock screw and unscrewing the eye from the rod.
3 - Remove the bump stop.
4 - push the rod all the way down.
5 - twist the rod to adjust.
I never managed to do this as I never managed to remove the upper eye.
I got my shocks rebuilt by a Koni specialist in the UK and just put them back on the car. The ride is much better.
See http://www.koni.com/_cars/frame.html
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