Just a thought here. Backing the adjustment screw out Counter clockwise is what tightens the stearing box. Oposite to most US cars.

Also adjustment must be made with the stearing wheel in center position and pitman arm disconnected. If your car is 3 turns lock to lock then turn to lock and back off 1 1/2 turn. Adjustmet is correct when rotational torque through center increases by about 60 in-oz as you pass through center. Notice that is inch ounces not inch pounds. 60 in oz = 3.75 in-lb.

John Roncallo