If you use the armrest in your Fiero a lot, it may have developed an indentation where your elbow rests. This thread will present a way to restore the arm rest to like new condition.
For this procedure, you will need some high density foam and some special superglue for plastic. For the foam, you can use either a foam sleeping pad, such as used by campers or hikers, or carpet underlayment foam. I happened to have some sleeping pad foam left over from a previous job that required high density foam.
Position your armrest so that the back side faces you. Most likely, the soft plastic has separated from the hard plastic, making this step easy. Pull up the soft plastic, and remove all the foam under it in the area of the elbow indentation.
Be sure to remove all of the foam residue from the "lip" of the soft plastic. You will be gluing it back down later, and the glue does not adhere properly to the foam residue.
Cut a piece of foam to fill in the space where you removed the old foam. The space to fill is thicker towards the back side of the armrest, and my foam is not thick enough, so I made a smaller piece to go above the main foam piece. It would probably have been better to shape the small piece like a wedge.
Stuff the foam pieces into the armrest.
Glue the armrest back together. To do this, coat both edges with the adhesive promoter that comes with the glue kit, and then apply the glue to a short section of the hard plastic. Then position the soft plastic lip over the hard plastic, and hold down for a few seconds. (The glue sets very fast.) This is the hard part, because the soft plastic will have shrunk a bit over time. You will probably have to use a pocket knife blade to "persuade" the soft plastic lip to slip over the hard plastic edge. Because the glue sets fast, do only a little bit at a time -- no more than 2 inches (5 cm).
Your armrest should look as good as new when you are done.
