There is a special socket, it's 10mm hex, 1/2" drive, longer on the hex end than usual, with a universal joint on top.

HAZET 2755
MB 123 589 02 10 00

It's expensive but some determined people have done without it.

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86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm