Here is a simple repair that I did this weekend and only took 10 minutes to do. You'll need a trim removal tool, crimper, crimp lug (for 10 to 12 gauge wire), and nut/bolt.
1) Using the trim removal tool, carefully pry off the plastic retainer that is attached to the gas lid.
2) Crimp the lug to the gas cap tether using the crimper.
3) Carefully thread the bolt through the lug and through the hole in the gas lid where the plastic retainer used to be.
4) Attach nut to the other side and tighten.
Here are some pictures that I took that outlines this process. Hope the link works.
http://www.mazdas247.com/forum/album.php?albumid=568
1) Using the trim removal tool, carefully pry off the plastic retainer that is attached to the gas lid.
2) Crimp the lug to the gas cap tether using the crimper.
3) Carefully thread the bolt through the lug and through the hole in the gas lid where the plastic retainer used to be.
4) Attach nut to the other side and tighten.
Here are some pictures that I took that outlines this process. Hope the link works.
http://www.mazdas247.com/forum/album.php?albumid=568