I'm getting ready to reinstall the glass lens on the front of a euro light. There is a rubber gasket that seals the lens from the housing. Is there anything special I should do with the gasket before reinstalling the lens to make sure it seals correctly and doesn't leak?

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'86 420SE Euro
904 Midnight Blue, Gray Velour
Dad bought it new, now I own it.

"A Mercedes-Benz is like a fine wine, it only gets better with age."