Now, Phil's Xantia was still riding high despite his specialist's efforts.
As Little Horwood is reasonably close to Finmere, we headed off and made use of the ramps there, expecting to have to manually adjust the clamp on the rear ARB.
Up on the ramps, we had a gander and I spotted the manual linkage was pushing against the edge of the square hole it sits in, in the arm on the end of the actual height corrector.
This can have the effect of holding the suspension too high or too low depending on which side of the square hole it's up against.
The manual linkage is held onto the control rods, which run forward and back from the lever in the cabin, by a clamp tightened with an 8mm bolt.
Slackened this and adjusted the manual linkage so it's in the middle of the square hole.
Viola! The car settled down to just 1 finger height at the rear.
Here's a photo of the linkage in the right position, the square hole is outlined in red and the pip on the side of the manual linkage is outlined in blue.
Juliet had the same issue, with identical symptoms of the rear feeling hard and high, then after a *thunk* dropping and being soft, but returning to hard and high after going over a speed bump etc.
What happens is the two linkages fight against each other, forcing the pip on the side of the manual linkage to pop out allowing the ARB linkage to do it's job.
Going over a bump reseats the pip and the fight starts again.
