I received 2 Gypsy Grippers (Little Gripper and In-Between Gripper) for Christmas. Since I already own the large one and use it all the time, I figured these smaller suction devices would come in handy to use on my 4 and 6 inch square rulers--WRONG!!! I have tried several times to attach it to some of them and they just won't grip. I think it may have something to do with the thickness of the ruler. Has anyone experienced this? I need them since I took a "chunk" of my index finger off and have several projects left to cut. Anyone??? Advice please!