Each seam was pressed OPEN before adding more strips. It helps to use a hot dry iron and lift the seam up in front of the point to get a crisply pressed seam.
Pressing the seam allowances open distributes the bulk better on these narrow strips. After all the seams are pressed open, I gave the whole unit a good press with lots of steam to get everything nice and flat and straight.
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I used a 4-1/2" wide ruler to trim one side of each unit 3/4" from the last seam, then made sure the other side was trimmed exactly 4-1/2" from the first cut.
I used a 3-1/2" wide ruler to cut the individual units, keeping the fabric straight on the cutting mat and being sure the edges were squared.
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I was able to cut 11 "reel" units from each assembled set of strips, and got it all done before noon today! WHOO-HOO!!
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