Here's a quote from a chapter of a book called MODERN HUNTING OPTICS, and the chapter is an extended version of an article published in a major American shooting magazine: "Just because two dogs touch noses doesn’t mean their bodies line up. A pair of cone-type alignment rods can work, but only if a straight-edge is placed alongside both rods--or the rods are turned around so their flat ends butt against each other."
If you can't imagine two dogs touching noses, take two sharp pencils and place them on a table. Note that they do NOT have be perfectly in line for their tips to touch. In fact they can be at 90-degree angles to each other.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
