Thanks all -Have loaded and hosed with PB blaster.

This one is in a very awkward position. I've barely enough clearance to get the 19mm around the adjuster nut (tapered shaft pointing upward).

Considering going back to the rental desk and trying a different tool.
When using a picklefork, is the only danger in damaging the boot?
Obviously not an issue here as I am rebooting, but any other issues? Wouldn't want to damage the ball joint...

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1981 240D 4sp manual. Ivory White.