Wheel height adjuster.

A handy person from Colorado says:
This picture is missing the plastic tab that is approximately 2 inches long and rises up along the outside off the screen door frame. It is held in place with a small screw.
Thumbnail of the uploaded file named 20220225_134926.jpg
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Tom from SWISCO responded:

Hello! Looks like you need a new screen frame corner. See our 95-020 for my recommendation. If you also needed a new roller then I would suggest the 84-016.

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