Your break seems to be very small...I broke a large wave ruler in half. I thought, this will never work again, even glued. I used super glue and it worked great. I even tried to put pressure on the ruler by bending slightly to see if it was going to hold up. No problem. If you accidently put too much glue, wipe it with polish remover. If it dries with a rough spot, just use an emery cloth...but I didn't have any issues with a rough space. My break was 6.5 inches and all the way across the ruler. Best wishes