It turns out my open stair treads are aluminum. The 20 year old carpet on them was glued down. There is padding on top, the carpet wraps around and under the tread, and was glued on the sides and under the tread. The installer refused to put the new carpet down saying he had no way to keep the carpet in place until the adhesive set. Is there a way to keep the carpet in place on the underside of the tread until the glue dries? What glue is best to use? Thank you.