I did the tightening on my steering box for my 1977 240D. Loosen locknut while holding alloen screw in place. Then turn allen screy no mkore than 1/8 tuen at a time. At all costs avoind overtigntening the allen bolt as this wuill crusch sometuing inside. Trial and error. Made a good difference in my steering.

FYI, be sure at the same time to tighten the three steering box mounting bolts inside the left front wheel well. Don't loosen them. Takes 15mm socket. torque to 58 lbft.

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Douglas
1959 M-B 220S cabriolet