I took the handle off my 4 ton floor jack to use as a cheater bar on a big honking allen wrench (real allen wrench not a socket)....it came out with little trouble...I seem to remember my W116 plug being somewhat tighter however...a 4 foot cheater bar however made that hard to judge.....sun was setting when I finished my valve adjustment.....8 of the ten valves were tighter than spec.

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche