Before you install glass, before you glaze, before you finish paint, you should be sure your nice, new, square storm windows fit your old, janky, out of square window openings. It’s not so easy. Basically you are trimming a rectangle that has straight edges and 90 degree corners into a parallelogram that doesn’t have straight edges. Just how do you do it? Well it takes some practice, but what I’m doing in the video is the basic (and realistic) idea.
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