There are velcro strips with adhesive you place down the sides at the right point. There is a long strip for the top and then pieces you cut to fit on the sides as tight as you can. It takes some adjustments. Do not set too tight as the magnets may not always grab. About 16$ at H Depot but they are too wide. In our case my wife sewed over a section on each side to make more for 24" wide. Amazon will have narrower choices. I will take some pics before our next trip in mid June.
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