You will probably do valve adjustments once, maybe twice per year....get the wrenches designed for the job. I bought the set of two matching wrenches with a third tool that holds the spring (keeps it from rotating). I have done many valve adjustments, and I have not once used the spring holder thing, only the two wrenches.

Mark

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1984 300TD Wagon, 407,800 mi (current daily driver)
1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)