How do you replace rubber gasket on wiper motor assembly for W124?

[lpozzo]

Hi,

I have a 1990 300D (2.5TD) and I need to replace the rubber gasket/seal on the wiper motor assembly. The gasket is between the wiper arm and the back of the wiper motor linkage assembly. It is a rubber gasket that has a clamp around it.

Mercedes sells the rubber gasket and clamp but I don't know how to remove it from my wiper assembly. Can someone please provide a recommendation on how I can replace the rubber gasket on the assembly? I tried to take it apart but it seems not to separate so that I can slip the gasket out. Thanks.

Louis