This works like a charm to align half square triangles for quilting. You sew the squares, cut them in half, and before you cut the resulting triangle, place a ruler on the seam and use the ruler to align the triangle with the size of the block you want to make. Use the rotary cutter to cut off the excess and get a perfect HST result. Using this ruler I was able to "repurpose" some of the large remaining blocks to the correct size for the new smaller pattern. foolproof.
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