Bigsister has an excellent point about the use of the feed dogs. I am using my 1/4" foot for all my piecing just to be sure I've got the accuracy, but my joining the pieces and blocks was easier, and straighter especially at beginning and end of the run, when I used a regular foot and moved the needle so that I could keep both feed dogs on the material. I don't quite get the top seam/bottom seam instructions but I will try it and figure it out. Anything but those lumps on the back of the quilt!