Just to let you all know I took the landy for a short run to settle the springs and then checked the axle to chassis distance and all seemed about right tighten them up and I can't belive how much better it rides over pot holes and bumps...
When I did mine I loaded up the back with as much weight as I could til the chassis distance was roughly as per the book. Then drove about a while. Then tightened it all up. But with new springs being so variable I’m not sure the book distances...
I'm thinking a tank removal happened at some point and it was a plug. But would have been fairly hard to miss when it went back together. That said it was screwed in a long way.
The question is what devilry was the PO trying to cure when he stuck the screw there in the 1st place?
Now it’s gone, 3 months down the road you’ll no doubt figure out what the bodge was trying to sort - just after you’ve forgotten you removed it...