Originally Posted by 84stock
Just take a pair of pliers and remove the copper cap on the top of the box. Then loosen the set nut and tighten the screw in the middle. You only need to mess with the big "BIG" part if you cannot find enough adjustment here. Just wiggle the wheel, tighten a little, wiggle it, tighten etc. To tight and it will be sticky and cause irreversable wear (that's where you hear how they tightened it and it only lasted a couple weeks).
I have to disagree. On any other steering box, what you say is true. But these are completely different, and that adjustment performs a completely different function on these steering boxes. You can read the Mazspeed writeup on this to confirm.
On these boxes, you have to loosen the large thin nut, then turn the nut with the holes in it to adjust.