Interesting question.... just went out and looked at mine but I can't see anything too obvious. I'd try unscrewing all the screws I could find on it and maybe something will pop out (figuratively or literally).
If you figure it out please tell us how, because I'll be doing something like this in a month or so...
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'81 300TD Wagon 355k (Miss Diesel)
'83 300SD 180k
'84 500SEL 190k (Parting it out)
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