As the adjustment is on the top of the box, you need a 19 mm socket to break the lock nut loose, 19 mm wrench to counter-hold the lock nut & a long 6 mm Allen socket to adjust.
Turning the 6 mm Allen COUNTER-CLOCK WISE takes out the play!
BE VERY careful & turn 1/8 turn at a time & then make sure that it's not too tight. Many times the play is else-where.
Watch the pitman arm turn as the input shaft moves.

[Edited by M.B.DOC on 01-03-2001 at 06:03 PM]