The air ducts in my house have a couple of places where they make popping sounds as they expand while heating, one of the loudest ones is annoyingly in my bedroom.
I know by pressing around where I need to add compression against the wall in order to secure it in place to stop the popping. But I can't get a drill/screw in there since the hole is too small. My thought is if I can find something like a curtain tension rod I can put it inside the duct and push the walls apart which would give it no option to shift around in that area.
Problem is I absolutely can't find a tension rod short enough online. Is there a similar tool I can use that can range between 3" - 5" in length and acts like a tension rod?