I've seen mason's who could set their line exactly where they wanted the edge of the brick or block to be. Whenever I try to use a line this way, I find that it is easy to get out of alignment on a long run since you can accidentally set a brick that pushes on the line a little. I find it easer to set the line so it is some known distance away from the face of the brick and use something of that thickness to judge how well the brick is set. Which method is the "standard practice"?