Below is what the rusted magnet and handle look like.
How to remove shower door magnet.
Swinging shower doors are held in place using a magnet set in the latch of the door.
The materials that you will need to install a magnet strip on to a glass shower door is a sheet of thin magnet which can be found at any local hardware store or online the adhesive method of your choice something to cut the magnet with a measuring tool and a screwdriver to open the latch.
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Lastly does the door need to be removed in order fix the issue.
The strike plate seems fine.
Gordon glass shower door strike jamb magnet for swing shower doors 2 1 2 long t magnet for shower doors shower doors handles 4 3 out of 5 stars 27 15 50 15.
Does the entire door handle need to be replaced.
When the door closes the magnet adheres to the metal surface of the shower frame and keeps the door closed.