Window will not close due to malfunction in Channel Balance

When I tried closing the window last night, I heard a sound, like a twang. Now the window will not close all the way...shy about 6". Took the window out today and it appears one of the mechanisms in the Channel Balance is seized up, preventing the window from closing and I cannot get the channel removed from the anchor. Looks like the rope is frayed, so, I may need to cut it to release the channel and take the anchor out. Hoping I can install the window again, until I get a replacement channel balance. The window is an H-LC25-36x48. Please identify what the replacement number for the Channel Balance is and let me know so I can order a replacement. The channel is 26" long X 1/2" wide. Thank you!!!

Thank you for the detailed response. You are correct. The channel measures 27" from end to end. I had to cut the rope. I wasn't concerned that it would snap. As I said, one if the mechanisms was frozen, so, the entire channel balance was just hanging. In order to put the window back in, I had no choice but to cut the rope. Thank you for your help. I will order a replacement channel balance based in your recommendation.