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As I recall, the drain plug is, in effect, a large Allen-head pipe thread set screw. If the hex recess is damaged, there's nothing to grab onto, with one small possible exception. If enough of the plug is protruding, you might be able to use a hammer and chisel around the edges to gradually work the plug around and eventually out. Gentle warming with a torch beforehand will help.
If that doesn't work, you can suck out the old oil, replace it with new, and leave the hard part for some other day. On that "other day," you remove the cover, drill a hole in the plug, and use an EZ-out to remove the plug. Put rags inside the diff during the drilling to minimize chip scattering and flush well before refitting the cover and adding new fluid.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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