"One thing I have found essential to my Moleskinerie: a Staedtler Erasing Shield. It’s a paper-thin sheet of metal with various shapes cutout, used in drafting to erase small portions of lines without disturbing other lines. You can get them for less than a dollar. Tuck one in each of the pockets of your Moleskine pocket notebook and you have a straight edge, plus various stencils (curves, circles, etc.). A Must-Have Molskine Mate."