I missed a tremendous opportunity when I didn't have a picture taken of me doing a removal on a 1983 W123 after the plug had been in the same spot for around 25 years:
> All sorts of parts removed to enable access.
> BIG Allen wrench in the plug. Mine's bigger than yours, LOL.
> Heavy caliber and long pipe on the Allen wrench.
> Me standing over/straddling the engine.
> Be sure we are 100% certain which way is counter-clockwise

I won.

I still have that plug...keep it on my desk as a reminder about life's little challenges.