We have 4 windows which do not stay open. I have dismantled some and found that some have broken springs and some have broken cords. In some cases, both are broken.Attached are photos of the window and channel. The Channel is 23.25 inches long and 1/2 inch wide, It is stamped with the # 3054. The window itself has a label showing G1988 Type A. Can you recommend a replacement channel.
Thank you,
Robert