Power stearing

Hi all sorry not to have introduced myself, not much time and one burning question, my 4 bolt power stearing box on my 93 Disco was leaking so i have had the top off and changed the washer and nut this seams to have stopped the leak, the problem i have now is the stearing seams to have loads of play. Used the bleed on the top is there anything i have missed? have i done the allen key up to tight in the centre? any help would be great.

Many thanks Greg