The shower door had fallen off the frame, presumably due to the pivot giving in to age and wear. For context, the property was built in the 90's, and I have reached out to the original brand ('Regency') for their advice, but I doubt they would be able to provide a direct replacement. I just wanted to see if it's salvageable or if people can have door replacement in these scenarios, as replacing the whole shower screen would be the least desired option.