Ran a long piece of Aluminum angle between the vee blocks and clamped it in place to act as a straight line for the layout. The tube is held down to the vee blocks so it won't move. Positioned two 1x2x3 blocks on the 3 and placed a 5 degree angle to scribe one side of the 10 degree cut line. Picked up the center line and scribed it half way around the tube. Did one side of the tube then changed the setup to continue the lines on the other side of the tube.