It's not too hard. I think there's some writeup on it in the archives, but I replaced mine (without removing door panel) and it was quite simple. And if I think it's simple, then it's simple.

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John Schroader
bio burnin' 83 300D, '83 300 SD, '79 240D
"I've never met a man who was good at making excuses who was good at anything else" Ben Franklin
"You cannot permanently help a man by doing for him what he could and should do for himself" Abraham Lincoln