Originally Posted by awjoker
After reading my reply, it wasn't clear that I would work with the TUBE end of the awning. It is this end that floats. As you already mentioned, the upper end uses a set screw. Leave it in place and work with the end that caused the problem.
Extend the awning, let it set in the sun to warm, after about an hour, on the tube end, measure the distance from a common point to the edge of the awning material. Center the material on the tube. I drill a hole in the hem and install a 3/16" large head pop rivet in each end to make it stay centered. Have never had a problem with them wrinkling again.