All the manuals state the same thing. Jack up the front wheels so both are off the ground. Make sure that the wheels are pointing straight ahead (this is because of the normal slack that will occur off centre). Loosen the lock nut and adjust the centre screw until there is less than 1/3 inch play at the steering wheel without the output shaft of the steering box moving. This is assuming that you have another person to help you. Personally I just get underneath it and move the input shaft by hand while holding the output shaft. I adjust it until there is minimal slop between the two. Recheck once you retighten the lock nut as it will move the screw up a little when you tighten it.
Once you are happy, move the steering from lock to lock and make sure there are no stiff points. But again, only worry about slop and left or right lock if they are significantly different to each other. If you have say 2 inch slop on one lock and none at the other, you are up for a reco box. Also, if you are getting a stiffness at the same place in the rotation of the wheel, it is most likely the uni's on the shaft between the steering column and the box, rather than the box itself.
I hope this is of help.
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