screen corners aluminum

A quick learner from FL says:
my screen corners have broken after all they are years old ,, how do you get the old broken piece out of the frame >???
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Bob from SWISCO responded:

Thanks for posting. For a stamped corner key, see the video below for removal and replacement details. If this seems different from what you have, let us see photos of your current corner key and we'll do our best to suggest an alternative method.

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