Dave Sr. from SWISCO responded:
August 30, 2010
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.
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Dave Sr. from SWISCO responded:
August 30, 2010
The 70-097 is the only spring we offer that is Stainless Steel.
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