Part # 801020
Patent 5232208
These are the only numbers I see. Someone said they think this is a constant force balancer. The window will only open a few inches. It is like the metal piece is crinkling up on the left side of the window. The piece needs to be replaced. Sure hope you can help us. The window was purchased from The Window Factory in San Diego but they have gone out of business.
Thank you and fingers crossed that you have the part we need.
Mary