I bought every gadget I could find to keep the ruler from slipping. I went to a class and the instructor led off with "don't let your ruler slip by running your rotary up above where your hand is anchoring" it. Dah. I am sure we all know that but I was always "zipping" my rotary up to the end of the ruler thinking I had enough pressure to keep from slipping. Now when I cut I go a little slower and adjust my hand on the ruler, what a difference.