Tic marks in Chart options

There is one exercise we do in labs to show college students how to partially "simulate" the cave-person approach to graphical analysis with paper, ruler, and pencil. In order to keep the Chart "clean" - too many grid-lines is avoided and turning on minor tics is used instead.

I cannot find an option to put minor ticks on BOTH sides of the chart - to aid them in running a straight edge across the page equidistant from a nearby grid-line. Is there an easy way to do this or an alternative approach?  Just curious.