I've got a (I believe) Billy Bags dvd rack which isn't big enough for my DVD collection. I want to either reconfigure this one or just build a new one. The rack is something like a Pro-1000, but I can't be sure of the exact model. Anyway, what I want to do is make the rack 2-3' wider by either building a new one or just changing the length of the rack tubing. My problem is I have no idea were to find such a tube. It's about 1/2-3/4" in diameter, hollow, but with ends which are female threaded for screws which attach to the sides. There was an ancient thread here from maybe 2002 where people were discussing this type of tubing, but all the links are dead now. Any idea where someone could buy this type of tubing?