This is for someone at work, and not on an MB:
The sump bolt head has been rounded by a failed attempt to remove it with a ring spanner. A subsequent attempt with a pair of multigrips also failed.
Does anyone have any ideas for how to get it off?
It's a conventional protruding bold head. Obviously the bolt will need to be replaced once removed, but the objective is to not damage the sump.
Ta
Lukas