My sister has a Sweet 16, and she uses the Line Tamer ruler, also. What is great about that ruler is that it is shaped like a tuning fork--two rulers with a 1/2" opening--just wide enough to allow the ruler foot to sit inside it. So, you just aim the Line Tamer where you want the line to go, and the stitching line is easier to visualize than "I must position the [other] ruler 1/4" away from where I think the stitching line will be. I was so impressed with the Line Tamer that I bought a 3/16" high Line Tamer ruler for my domestic machine (a Viking Sapphire.)