Removing fuel filler flap

[Francophile]

Hello again,


I would like to remove the fuel filler cover flap to rectify some minor rust , both in the recess, and inside the flap.



Being totally ignorant about modern (post 70s) vehicles, I'm bewildered by the long 'bolts' which fix the hinge to the body shell. They are very long, and have a peculiar narrow extension beyond the thread. Are they accessible from within the body, or are they removed from the outside. In the latter case, I assume the narrow 'extension' is to accept some sort of clamping tool, like a drill chuck.


Thanks in advance for any guidance.



Derek.