What was the most challenging repair you've ever done, and how did you overcome it?

IDK about MOST challenging, but this one sticks out in my mind as among the most aggravating.

TLDR: '00 Olds Silhouette (Chevy Venture / Pont Montana) power steering lines. Rack end fittings had no access except from the top, putting me shoulder deep. Very stubborn fittings and I swear they were 17.5 MM - nothing fit well. And there was pretty much no room to get in there with anything but a wrench.

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