I have a HQ Sixteen LA, not a sit down machine but I think the rulers you use are probably the same. I have quite a few HQ rulers but tend to use the same ones over and over. You have to have a good straight line one and one that will do your circles/curves. I have several that do different sized curves. And, I'm in a ruler club at my local LA group so we get new rulers all the time. I still go back to the favorites.