Interesting discussion. I sandwich w/ either Sharon Schambers herringbone method (which uses boards) or w/ safety pins or with straight pins and pinmoors. I have never run into a problem w/ the herringbone method. I SITD starting at the same side each time. I have also used safety pins but sometimes do get tucks. I do not like the big hole they make so I doubt I will use them again. I have recently used fine long straight pins (flower heads) w/ pinmoors which I liked but since I only have 20 pinmoors, I started in the center of a baby quilt and worked outward. It worked well. I plan to buy more of the pinmoors. I think Prism might be onto something about the starch. No puckering with batiks which have substantial fabric count (thicker) and the most problem w/ puckering was with the extra wide fabric which was thinner. Thinking back, I think the extra starch would have worked. This will be an interesting post to follow.