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I was having the same issue with mine, and yes, the boxes can be touchy. I finally got mine straightened out but the adjustment is backwards from what I consider normal. I had about an inch and a quarter wheel play that was dead at the wheels and it took 3/4 of a turn of the adjuster to get it to tighten up.
Here's the kicker...you have to back the adjuster out to get it to tighten. The sector shaft loads from the bottom on the Mercedes boxes and I guess it must be spring loaded somehow. When you back the adjuster out of the box the sector shaft moves deeper into the worm and takes the slop out of the box. You can do it, just go a little at a time and when you are no longer gaining run the adjuster back in an 1/8th of a turn.
Theres actually a procedure in the FSM but you have to pull the box and I'd prefer not to go through the hassle. Just my opinion.
Good luck.
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