I have had better luck with my straight stitching on my FW when I bought a 1/4 foot that fit. The foot that came with the machine was loose. I also put down a stack of strips of blue tape on the 1/4 line when I am teaching (sometimes just for me...), so I have someplace to butt the fabric up to. Makes piecing fun again! I can post a picture of the 1/4 foot if someone wants to see it.