For me - probably re-greasing a rear wheel bearing on a W123 trailing arm with only one special tool (the socket for one of those stoopid slotted nuts) => with the trailing arm removed from the car (try it - no reaction forces makes it more interesting!)

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!