After building the teardrop and fiddling with the tensioning strap we got the doors to fit pretty well, but over time the tensioning strap seems to stretch a bit also. With no adjustment capability in the strap once it has been screwed on this becomes problematic. I really didn’t want to have to take out the screws, move their location in the strap and then screw them back in. I finally came upon a way to make a minor tension increase in the strap without removing anything, I purchased a couple of 1/4″ x 2″ S-hooks meant for connecting chains to eye hooks at the hardware store. They can be woven into the strap without removal to add a little tension. They seem to work great!