Our Micra had one of the headlamp fuse done pretty much like that before we got it.
I was lucky enough to just have to clean the fuel pump fuse holder up and fit a new fuse.
This was over 6 years ago. Just found my old post.
http://www.ilexa.co.uk/forum/index.php?topic=463.0
It was a nightmare, so I always keep an eye on this forum to see if I can help anyone else.
Hope yours is as easy to fix