I recently splurged and bought a gadget called "The Original Gypsy Gripper". It is one of my pricier gadgets for quilting but I wish I had it long ago because it really holds my rulers firmly in place with NO slipping. Here is the web site -- I didn't understand about clicking the browser button. Guess I have to learn the computer as well as the quilting! Hope this explains what it is. Just copy and paste into the thing (you know what that is!)
thegypsyquilter.com