The manual calls for a procedure with a dial indicator to set the end paly. I did not use the dial indicator the first time and overheated the grease in mine and had to do the job over after removing the roasted grease.
Since the time I did the above when I had the had the Hub off of the Spindle I always adjusted it with a dial indicator and that has always worked 100% for me.

like a lot of people I had like 45+ years of previous experience just doing that by feel with no dial indicator on other vehicles I have owned since 1968 but that filed to work for me on the Mercedes.

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84 300D, 82 Volvo 244Gl Diesel