I have found the BEST gripper around. Use it to keep my straightedges from sliding when I am cutting glass. I have a narrow edge on each of my rulers and it is fabulous. Now have it on all my quilt rules.
Called "Wedgietape" by The Emerald Rainbow. You can Google it and it is very inexpensive, 24" to a package and it cuts to size and sticks forever!
PK