Originally Posted by
juneayerza
The sidelock is
NOT meant to be used on top of another ruler. The ruler underneath can move because it will slide on top of the fabric. If you haven't watched this video, please do so, I think it will answer any questions you have.
https://www.youtube.com/watch?v=hYOoRetnlfM By the way, I love these rulers and use them always; they are so much safer.
I use it on
top of the ruler. It works best for me that way. The ruler has never slipped on the fabric, too much pressure on it from the grippers.