I really appreciate your replies on this, but I've got a confession to make. I think I may have over reacted to what I thought was a problem which turned out not to be a problem (or at least that is my current thought). I spend a fair amount of time reading various post especially those pertaining to W210's and I keep expecting the problems I read about to happen to me. The window regulator is a classic example. Been reading about it for some time now and lo and behold mine broke 2 weeks ago. I had read many post about the belt tensioner and when I saw mine wobbling yesterday I jumped to an incorrect conclusion (that mine was going to "come apart" any minute). I was so convinced that I called Phil (FastLane) this AM and ordered a tensioner (couldn't find just the pulley). I decided to take one more look at the "wobbling" pulley and discovered that it wasn't wobbling, but was rather moving in and out parallel to the belt. Took it to an indy around the corner and he said it looked fine to him the movement was as it should be.

Lessons learned:
1. All about tensioners (or at least a lot more than I knew)
2. You really need to accurately to describe the symptoms to get help on ShopForum, ie wobble vs. lateral movement.
3. Don't get too carried away with what you read and misapply it to your situation. (Ever read a medical book and decided that you had all of the diseases described there?)

All of this is not for naught, I will probably have to replace that tensioner someday. Keeping a close eye on the harmonic balancer and trying to keep an open mind about that! Special thanks to BenzRepair and Gilly. You guys are the greatest. Now I gotta go replace that window regulator; parts arrived today.
Guy

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Guy Everhart

1998 E320 Wagon