Halsteg,
I plan to do another post on this later- but my tensioner on the 96 e300 looked like the pic I'm attaching (which is similar to my 87 190d too.) Circled in the picture is the pointy end of an old fashioned tire iron which is inserted into the tensioner spring pivot. To the right of that is a nut to be loosened. To slacken the belt on this car, you have to undo the nut on the right with a wrench- while maintaining pressure on the spring loaded tensioner and the belt, by pushing the tire iron to the left. Don't force it- just try and hold it in place where it is- isn't very much force. Then after removing the nut, you push the bolt back toward the engine to get it out of the tensioner pivot, and SLOWLY, CAREFULLY release the tension on the tensioner by allowing the tire iron to move to the right. Let me know if this helps. Pic is below.
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