Leavitt pointed out this car that had just arrived at his shop for repairs. The team had already cut away many of the damaged tubes, including this area. You can see flat spots in the tubing created by a grinder. Leavitt says that the flat spots create thin areas in the tubing and weakens it. When cutting away bars and grinding off the weld, you have to be very careful to follow the contour of the tubing that's to remain and not grind into it too much. It takes a steady hand and a lot of experience to be good at this.