21. There’s more than one way to get the bends lined up in the same plane, but the one we’ve seen most professionals use is the “eyeball” method. You sight down the tube and line up the bend with the top edge of the die. Do this while the tube is loosely clamped in the bender, and then tighten things down when the tube and the die are properly lined up. Done correctly, this is more accurate than using a bubble level. Take your time. Coincidentally, the white fridge behind the tubing made it easier to get things lined up. Can’t see? Put some white paper in the background or rig up some more lighting.