Unable to locate correct roller
Thanks for posting. I'm afraid we cannot help with this roller. I actually believe this screen door was made by a company who was called Bayform, but they went out of business a long time ago and nobody ever picked up production of their doors or hardware.
This makes it especially difficult since this roller is literally built into the frame. I don't think there is any solution available. It may be time for a new door. I apologize for the inconvenience.
Sorry to be the bearer of bad news! This isn't the only part from Bayform that unfortunately there's just no solution to anymore. Let us know if you have any other hardware-related questions.