I had one that did the same thing. Here's how I fixed it. Take it down and remove the affected roller from the bracket. Pull out each end. At one end there is a long spring attached to a plastic coupling. That is where mine broke.....the plastic coupling, I can't imagine the spring breaking. Take a small drill bit and drill a hole in each end of the broken plastic. Get a small piece of steel wire that will go into the holes and epoxy the devil out of both ends of the plastic and stick the two ends together and let dry overnight. Works like a charm or order the new part from MCD for a good chunk of change. Good luck.