Originally Posted by
MsHeirloom
My understanding is that the "scant" 1/4" seam allowance works because the "turn of the cloth"- fold takes up a small amount. If the seam allowance is slightly less than 1/4" the finished block will be closer to the actual size block one is trying to accomplish!
EXACTLY!! You lose the tiniest bit of measure with that fold, and it all adds up! And the more seams you have in a block, the more it will matter on the finished size. That scant bit you subtract from your seam allowance makes up that difference so that you'll have a perfect ending size block.