Roll up screen repair
 

We have a garage screen door that needs some minor repair. We backed into it (again) with the car and pulled one side out of the track. I've been trying to re-zip it again, but haven't been successful yet. Has anyone done it themselves? I could call Michelle's again, but prefer not to pay them if I can do it myself.
Anybody know how? Have you ever found a video online?

If not, who does repair for lower cost?