2. If the dent is very small, there is no point in leveling it at all.
Attention! Hold a block of wood firmly against the back of the metal to absorb hammer blows and prevent the metal from stretching.
3. If the dent is in a part of the body that has a double layer, or something else makes it impossible to access from the inside, a different procedure must be applied. Drill several small holes in the metal inside the damaged surface, preferably in the deepest parts. Drive long, self-tapping screws into the holes so that they engage the metal firmly. The dent can now be straightened out by pulling on the protruding screw heads with pliers.
4. The next step in the repair is to remove paint from the damaged surface and from the surrounding metal by about 2.5 cm. This is done with a wire brush or a grinding disc worn on a drill, however, this can be done manually with sandpaper with no less efficiency.. To complete the putty preparations, scrape the surface of the exposed metal with a screwdriver or file, or drill small holes in the damaged area. This will ensure good adhesion of metal and glazing. To complete the repair, See the subsection on filling and painting later in this chapter.