Be sure and take in to account the wear state of the worm shaft. They are invariably worn in the straight ahead position. If you adjust in this position it will bind when you turn. You must adjust off centre and put up with any slop in the straight ahead position I'm afraid.
My method is to raise front, turn 1/4 rotation one way, tighten to resistance, back off so wheel turns free and tighten lock nut. Then turn lock to lock to check free movement with no slop off centre. If there is no play in the straight ahead position after this you have a good box.
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This very helpful. Thanks for sharing.