Personally, I use the 1/2"dr. ratchet, 6"extension and 27mm deep socket. To advance it from one-lobe-peak of the cam to the next, it takes 4 strokes of the ratchet from driver's side to passenger. It's the FSM recommended method and the brief interval to advance the engine, sure gives your back a break from prolonged leaning over the engine. Also, the valve adjustment can be done with un-bent wrenches. It's a little more tedious but doable.

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Sam

84 300SD 350K+ miles ( Blue Belle )