194 Section 2 Nonstructural Repairs Copyright Goodheart-Willcox Co., Inc. Two-Sided Repair, Body Line When performing a two-sided repair that involves a body line, the body line is the strongest part of the damage and, therefore, must be corrected first. Most of the damage in the low-crown area will be raised with the body line. The steps in performing this type of repair are as follows: 1. Raising—Raise the body line with a body chisel. See Figure 9-45. The body line will resist move- ment, so hard blows on the chisel may be required to raise the body line. Make sure to raise the body line to its proper height. 2. Stretching—Damaged body lines are often upset. To correct the upset and false stretch, place the chisel on the back side of the body line and push out. From the outside, lightly hammer on the chisel to stretch out the body line. 3. Picking and filing—File across the damaged areas adjacent to the body line. Look for shiny spots that indicate high areas. Lower the high areas by picking, while supporting the panel from underneath with a dolly. Do not hit the dolly when picking. 4. Shrinking—Make a shrink fence around the area to be filled to prevent “chasing the dent” across the panel. The shrink fence will tighten up the metal. Arrowheads Arrowheads are caused by lateral force on a high- crown panel. The arrowhead is an area of upset. The strongest part of the damage is the area at the point of the arrowhead. See Figure 9-46. One-Sided Repair, No Body Line The steps in performing a one-sided arrowhead repair that does not involve a body line are as follows: 1. Raising—Remove the paint from the repair area. Weld draw pins in the low spots at each arrowhead. See Figure 9-47. Starting with the upper left pin and working clockwise, pull each pin out slightly with the slide hammer. Repeat the sequence, gradually pulling up each pin. Continue working the pins up, being careful not to pull the damage too high. Once the damaged metal is raised to within 1/8″ of its proper height, begin the leveling process. 2. Leveling—While pulling out with the slide hammer, tap down the ridge around the arrowhead with a flat-faced dinging hammer. Use a gradual approach. Start at the bottom of the arrowhead and work upward. Alternate tapping from one side of the arrowhead to the other. Goodheart-Willcox Publisher Figure 9-45. A body chisel is used to move the body line out. Note that the face of this chisel is covered with green masking tape to prevent it from cutting the metal. Chisel Goodheart-Willcox Publisher Figure 9-46. These are the parts of an arrowhead. The point of the arrowhead is the strongest part of the damage. Arrowhead Shaft Arrowhead side Arrowhead point Arrowhead side Goodheart-Willcox Publisher Figure 9-47. This damage has several arrowheads. Draw pins are welded at the low areas of each arrowhead. Draw pins