Looks like you could do a roadside appendix removal operation with that tool kit !Not in R230, and not in a glove box, but I fitted one in my old car in the driver's footwell - aftermarket, permanently on, for solar charger:
... and more recently, one in the boot in my current C169.
I bought an OEM socket from MB Oxford and Richard from ComandOnline very kindly sent me an OEM plug - the rest was easy: power from the rear passenger socket (as intended by MB - same fuse listed for both sockets), ground point was nearby:
To me it looks as if it was always there:
I did better: rewired turn indicator sockets in 169's headlights via the dipped beam bulb hatchLooks like you could do a roadside appendix removal operation with that tool kit !