How to adjust rocker shaft on discovery td5

There are adjustment screws on the rockets according to RAVE.
The procedure is as follows:
1) Rotate the engine clockwise until No 1 injector lobe is at full lift.
2) Rotate rocker adjusting screw clockwise until the injector plunger is felt to bottom out.
3) Rotate rocket adjusting screw anti-clockwise one complete turn to give plunger the required bump clearance and tighten rocker arm adjusting screw locknut to 16Nm. Ensure the screw does not turn as the locknut is tightened.
4) Carry out the procedure for the remaining 4 rocker arms.
5) After completion of rocker arm adjustment slowly rotate engine clockwise 2 complete turns by hand to ensure that no injectors are bottoming out on their plungers.