I tried Horshack's method, and got the same result as I did using LensAlign and FocusTune. I think the positive is that you can use it focusing on something at normal shooting distance. The negative is that if getting to one end of the range involves going past -20 or +20 (on the Nikon) you don't really know where the true endpoint is, although there is a workaround. But kudos to Horshack for thinking outside of the box.