[burniburn]

I rebuilt my diff last night (using the circlips pliers and new parts) and installed it without paying further attention to the screw sides...

This morning I tested the car and as I had the grub screw on the right looking from the back the diff got undone after only a few accelerations... I had used loctite on the grub screw thread but it did not change anything.

Once I put the diff back into the other direction with grub screw on the left side it stayed shut.