Coping tubing is usually a practice of patience. Cut it long, sneak up on it, check it, sneak up on it some more, check again, sneak up on it some more, repeat 100 times, then BAM! Went too far. I did this one a little differently. Not sure if it's a common way, but it worked for me. I took a piece of scrap, held it in place, and I used a compass to scribe around it like I would for a wood project. I did this to both ends of the scrap, coped them, and marked them DS and PS. I then cut my bent tube to a length I guesstimated would be close, and rolled the DS cope around the PS of the tube marking along the way, them swapped sides and repeated. By using the opposite pieces to mark with, this made a mirror image transfer onto the correct side of the tube. I had to repeat it a few times because I cut the length of my piece a bit conservatively; I didn't want to do this one over again. But overall it went pretty smoothly. Here it's propped in place, spaced 3/4" away from the inside face of the grill.