I have a Baby Lock Tiara which is the same as your HQ sit down. I have problems using rulers with the regular foot - it is too thin and can easily slide under the ruler. I have contacted BabyLock and of course they say the foot can be used with rulers and I say no it cannot!! I'm hoping HandiQuilter will come out with a ruler for their Sweet Sixteen sit down and then BabyLock will follow. How do you manage using rulers? I really like ruler work but after my ruler slid under the foot and the needle smacked down on the ruler, I'm a little afraid to try again!!!