I obviously haven’t tried it, but the video does not show the new hanger being used on the old rod that was implied to be the initial goal of the project. Instead, they only show the hanger being used on rods with special grooves or notches cut into it. Making such a special rod seems to be a lot of work, and I assume that they wouldn’t do that unless it was necessary. But most importantly, it seems to me that the hanger would just collapse if put on a regular smooth rod.