I have found a use for a couple of broken rulers (about 6 x 24 size---ask my GSon how it got broken! Good thing it already had a bow in it.) They work well on my LA table where I place my pantographs. I use them to measure how far from the edge to place the panto and then use them as "weights' to hold the panto in place. The lines don't bother me while following the panto. The 12 1/2" square which is still in good shape works well too.