My Pella door wall came with a retractable screen door. After much looking, I was unable to find information on how to replace the spring located above in the faux transom. Finally after removing the door and 3 screws through the transom, I found the spring above the wheeled carriage broken on the fixed loop. After measuring it and looking at your website with the information provided, the
86-021 looks real close. Thanks for the information and the help. Jim