I use my walking foot to quilt. I use Crayola Ultra Washable markers to draw the lines, every color has washed out. I use a straight line ruler to draw the lines made by Swanson Tool Company. The width is 2 " and I have the 4ft and 6ft one. It makes the drawing of the line so fast and very straight. Home Depot and Lowes use to sell them about $2 per foot of the ruler. They are bright yellow metal. I lay the long ruler in the center of the quilt and mark both sides if I want 2" width. then I flip the ruler over and keep marking to the edge. Start from the center line and mark the other side. Diagonal quilting is the same way, corner to corner.