Is it possible to take these things apart to get them working again? If so, how? I have one that is fully unrolled and the return springs aren't pulling it back in.

It's in an EA81 wagon so they're not that easy to find anymore.

Anyone?

I fixed mine a few years back, I found my old post explaining how I did it.

Here ya go -

 

It's really easy. Take off the end caps. I used a nail to punch the pins out.Roll it up and throw a rubber band on it. Take some vise grips and twist the spring up nice and snug, don't twist it so much that it breaks the spring. Now with the tension on, have someone hold the vise grips while you put the opposite end cap back on. Once the pin is back in the end cap, you can release the vise grips. Voila!

Thanks man. I'll give it a try over the weekend.