IRS camber adjustment is made simple by installing the Kerscher rear anti-roll bar bolts.
A spanner (open ended wrench) is used on a hex bolt to make the adjustment.
I can't find a picture of the bolt so I will try to discribe it..
The forwardmost springplate bolt is substituted. The hole in the springplate is enlarged to a circle that is the same diameter as the first shoulder. The new bolt then rotates in the sprigplate. The 2nd shoulder is eccentric and 12mm, threaded to take a lock-nut to secure the TA from the outside. The head of the bolt is in the middle
The other side of the same bolt is shouldered 10mm and locates the anti-roll bar drop-link. Offers +ve to -ve camber adjustment. Has zero effect on toe adjustment. Very trick.
Matt