I set about adjusting the steering box today (94 530).
From above:Remove the filter box, removed the washer bottles, loosen earth wire.
From below: removed an airpump? thing from next to the aircon pump.
The steering box on this car had no 17mm adjuster on top under the heatshield, but did have a 10mm locking nut with a allen key grub screw, on the end. Does anyone know what it does??