Steven:
I went with the tray idea because chain doesn't push well /forums/images/graemlins/wink.gif
I pull the drawer almost all the way out and just lay the chain in
back and forth until it is all in, takes about 4 seconds. shut the drawer and lock and your on your way.
I don't know of any PVC with a 5 inch dia. outside of ordering it from a plastic co. They have about any size your willing to pay for, but you could cut out a slot in some 5" thin wall tubing and make it work. good luck!