the guard on my 24 inch ruler is one you stick on. JoAnn's had them and other stores should. come in different lengths. i had my hubby cut one longer one and i used it on two rulers also.
here is one site with one
https://www.danemco.net/secure/sewezquilting.com/?a=VP&id=147]
https://www.danemco.net/secure/sewez...m/?a=VP&id=147[/url]