Alternator Brackets: 20 Valve

These are the brackets from a 1991 200 20V Sedan and Avant for comparison:

Alt: Edge of photo on Left.  A/C on right.

Closer photo of the A/C bracket. 

Notice the star wheel adjuster has a outer edge a bigger wrench can fit on.  Use this to tension.

Use the smaller 13mm? bolt to "hold" the tension setting.  It can strip EASY!