The pics Johnt49 provided looks like it is the same mechanism as the W123's so the link Yak provided with my method should work if you have a first aid kit opening in the same location.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked