installation tool or hole punch technique?

A home owner from California near the ocean says:
Hi, For 70-097, the stainless steel leaf springs for window screens, the installation hole is described on the web page as being 0.165inch by 0.180inch (a rectangle). Is there a tool available to make this hole in the screen frame? Or, if not, what technique would you use to make this hole (without collapsing the aluminum frame? I'm considering replacing springs on 20 windows, and that's a lot of hole punching into relatively fragile material!
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Dave Sr. from SWISCO responded:
We drill with a 3/16" drill bit, making sure the hole centers 3-3/16" apart. Also take a look at the 70-030 spring. Many manufactures are using this spring to eliminate drilling or punching the frame. However, the 70-030 spring is made to slip into the corner of the screen frame, you might have to take the frame apart to slip it in. Also look at the 70-011 spring, similar to the 70-097.
A home owner from Cambria, California on the Pacific ocean says:
Thanks for your response. The 70-097 is made of stainless steel. I live 2 blocks from the ocean. Between storms and salt air, conventional leaf springs don't hold up. Are the other springs you referred to available in stainless steel? Thanks!
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Dave Sr. from SWISCO responded:
The 70-097 is the only spring we offer that is Stainless Steel.
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