My crude illustration shows the line of stitches. If I were better at Google Docs, I would have added another "cut" line right below that. You don't sew the two pieces together at their original edges. You sew them together in a broad, curve and cut off the excess. This will save weight by eliminating fabric that essentially has no use. Remove the roughly triangular pieces of excess fabric leaving about a half inch seam allowance next to your line of stitches. Seal the edges of the seam with a candle, hot knife, lighter or whatever you have so they stay nice and neat.
Don't do like my neighbor who replaced the screen on a window, rolled the spline in the channel, then cut the screen along the INSIDE of the spline! DOH!!!!!
Good luck!
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