I would think there would be a site out there for the removal but I've done several searches in the past for me w124 and didn't find any.
I have the same prob with my sunroof where I want to take the roof liner etc apart and change the components.
The mechanism would be simliar on the 190 and 124 I am assuming.
if anyone has a site like that please post the url..

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Whether you think you can or cannot, Either way you're right!. by Henry Ford.