Dave Sr. from SWISCO responded:
September 13, 2017
You said that your corner has 7/16" stamped into one of the legs? Your screen could actually be 7/16" thick, not 3/8" thick. Take a look at the 95-053 corner key for a 7/16" X 3/4" screen frame to see if you think that might work in your screen frame.
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