I've been gifted with a big bag of squares cut with a pinked edge. Where is the 1/4" seam to be? Do you run the points of the pinked edge next to the presser foot? If so, does that really leave enough fabric in the seam that it won't be a weakened seam that will fray? I understand why we used to pink edges when making clothing with a 5/8" seam but why on quilt pieces?