I know I was told to keep the wheel on the concrete when edging. My question is what if the grass is say 2-3 inches lower than the concrete edge? Should you set the depth lower or turn around and go in the opposite direction with the wheel in the grass? What if on the lowest setting it still won't cut because the dfference between the concrete and the ground is too much?(With the wheel on the concrete) I don't mean to be a pain about this .I just want to hear from you guys who have been doing this for a long time. Edging is a new thing for me. Thanks for any help. Also how do you know how deep to set the edger?