Hammer if you really feel like it and want to go "Bam, bam, and bam!" but if you stop on your 1/4 seam allowance or rip it back to it from the center edge and swirl that, it all lays flat. Or it has always worked for us in making Stack n'whack . It is also working well with the [ATTACH=CONFIG]437696[/ATTACH]Spike Your English BOM on QB.