The problem you have is that the bridges are often bent and hard/impossible to fix without breaking them. If yours are not bent, lube it up (with the correct Mercedes lube) and replace the felt pads.

I tried fixing my sunroof and had the felt pads break apart once I got it going again. I might be able to make the bridge work with new pads but when I was at the parts yard I found a 190E made in December of 93 (one of the last off the line) and found the sunroof worked well so I pulled the bridge and it was in perfect shape. It looks like a different design than my early 93 190E. It certainly had a different transmission, as mine requires a 15mm socket and this one required a 16mm. I believe the assembly is basically the same if not exactly the same between the W201 and W124.

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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.