I've been thinking of lapping the backs of my barber hones because hone makers had this irritating habit of embossing their names into the front, rendering the last inch of the hone unusable, and some of these hones are none too long to begin with. I know there were some dual-grit hones that were meant to be used on both sides, but the ones that weren't...is there any good reason not to use the back? For example, is it possible that grit "settles" while the clay is still wet, thus producing a gradient or something?