At the end of this shaft you'll see two small circlips. Remove them so you can clean and inspect the end of the adjusting screw assembly.
If you haven't already removed the steering shaft flex disc assembly from the input shaft of the steering box, do so now.
You can now remove the 15mm hex headed bolts from the cap and remove the cap from the steering box.
You can now remove the working piston and steering worm assembly.
Now that you've removed the working piston assembly – slow down and take it easy. The steering worm / input shaft can still turn. If you unscrew this bit then the ball bearings will fall out.
Time for the first adjustment measurement!
Once you've removed the steering worm and working piston assembly (complete) the FSM says to check the over all condition of this part of the steering gear by measuring the friction / wear of the ball bearings and the races in the working piston.
If you have a fancy torque wrench that can measure between 5Ncm and 50Ncm and special tool attachments that will connect your toque wrench to the splined input shaft; or the special tools detailed in the FSM skip these next bits, measure the torque on the input shaft and go to the continuation of the dismantling procedure.