I use the Fons and Porter narrow ruler, I can't think of the name, either. I started using sand paper to hold the fabric in place while I draw the line. I was working on a quilt with many tiny pieces and the sandpaper really helped to keep them in shape. Now I have the sandpaper on a clipboard and use a very fine leaded mechanical pencil for any half square triangles that I work on. There are so many different methods to use. This works for me. Short cuts often don't work for me.