You are being too technical. The removal instructions for the tray are in the Owner's Manual. The metal tray just pulls out for cleaning. The wood trim just pops off. Once the metal tray is out there are two phillips screws that secure the tray frame. It is helpful to have a magnetic bit to get those screws back in. As you pull it out you pull out the ashtray light from the frame and disconnect the leads to the cigar lighter. IIRC Mercedes refers to it as a cigar lighter in the owner's manual.

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1987 300TD 231,000
#22, afterglow, plastic fan, euro lights, alternator upgrade, cluster housing update