The vertical creases are now made at the prescribed distances from the edge. Here the location of the creases is determined by setting the fence of the board shear to the proper measurement and making the crease on the outer edge of the board shear's table, using a bone folder. But this can also be accomplished by measuring, marking, and creasing against anything that is straight and has a fairly sharp edge or corner (though not so sharp that it will cut the folder stock, of course).