From Don-isewman
 

I wasnt sure where or what to do. I have a tip, for my quilt rulers. Depending on the size of the ruler.--1 x12--4 1/2 x4 1/2--6 x 12, etc.. I put the wide clear tape on the back's of ruler. Or clear scotch tape for my smaller rulers. To me this save the outer edges of the ruler from wearing away. Don-isewman

Thank you for the tip!