I'm almost curious enough now to take my door apart. But since time is always precious, and I've got several more critical repairs ahead of me, I'll have to defer to someone who's done this before. Sorry Gabriel.
These cars are built for the long haul and as such are usually designed to be repaired without going to extremes. It does seem logical that the engineers would design this part with some relatively simple means of replacement.

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Dave
1995 C280
1999 Triumph Daytona 955I - my speed fix.
1982 300TD - Gone, but not forgotten.