Am I understanding this term correctly? I'd like to know how in the world you can constantly concentrate on one thread over from a 1/4" seam. I've made many quilts and have never ever even stayed consistently on the 1/4" seam line for every single seam. I don't think it is humanly possible if you quilt for long periods of time like I do and my quilts turn out fine. Who dreamed up this idea? We aren't PERFECT!!! Give me the secret if there is one! I just keep thinking, "Seriously?????????????"