3/8" Screen Corner

You mention this is a 3/8" corner. Take a look at our 95-223. This is also for a 3/8" frame and looks similar in design to your own. Look it over and see if this would be a good match.

We are assuming the expose size of the corner is 3/8" thick and 3/4" high. The inside leg is 1/2" high and 11-32" thick. If this will work, you can screw in a small screw like the 33-072 to use as a stop.