I have the same problem. Also I find myself shaving the ruler with the Rotary cutter. That can't be good for the blade? I Found a Pc. of plexiglass left over from some project of my husbands. It's 8"X19" You could cut it smaller or larger but, I find the extra weight helpful and the edges are thicker than the ruler so there is less tendancy to ride up the edge with the Rotary cutter. I think the only thing better would be tempered glass. :?: