Steering Box Adjustment
I'm well acquainted with problem you mention (prior to the widespread use of rack and pinion steering, this was a standard procedure on re-circulating ball steering boxes), which is why I made the adjustment in small increments. I intend to drive the car and carefully look for any signs of friction or binding. Access on the 560 SL is very limited, and required a creative approach and a lot of patience. If anyone wants some tips on doing this, let me know.
1986 560SEC: 150,000 miles, runs great, but I've got to sell it (too many cars for one man)
1987 560SL: 122,000 miles, used to run poorly, now (thanks to forum), runs great!
1997 GMC Jimmy: Turned out to be a turkey.
1989 T-Bird Super Coupe: 150,000 miles, still runs great. Ford got it right.