I think most of us have run into this one before.

I recall using an 8mm closed-end where you can get it over the bolt head will help. An open-end simply doesn't have enough grip.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)