Try moving your arm from the shoulder, rather than from the wrist or elbow. More like, extending your arm as you cut. hard to explain, but I know that I can Feel the difference and my cuts don't move the end of the ruler to the left. I recently purchased a ruler with built-in sandpaper doo-dads - wanted to replace my 24" ruler with all the yellow markings - and I am really happy that I did. It Works beautifully! now I need to buy the stick-on's (because they're clear) for my favorite ruler.