storm window repair

A home owner from naples fl says:
I need the new corners. I have watched the repair how to videos. The corners of this old alumnum frame appear to have pressed dimples that hold in the corner pieces. Do I drill those out first before I try and separate the frame?

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Paul from SWISCO responded:
Yes, your corner keys are stamped, or pinned, and you will have to drill out the dimples before knocking the frame apart.
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