If the reverse side of the dent is accessible, you can set it by lightly hitting it from the reverse side, using a hammer with a wooden or plastic head. When performing this work, a wooden block should be kept on the opposite side to avoid buckling of the metal.
Hammer with rubber head
If a dent occurs in a place whose reverse side is inaccessible, another technology should be used. Drill a few small holes in the metal around the dented area. Then screw long self-tapping screws into the hole. After that, the dent can be pulled out by holding the screw heads with pliers.
The next step in the repair will be to remove the paint from the damaged area and another 2.5 cm from its border from the undamaged part of the body. This is easiest to do with a wire brush or drill bit, but you can also do it with regular sandpaper. To complete the filler preparation, scratch the surface of the bare metal with a screwdriver or the end of a file, or drill small holes in the damaged area. This will ensure better adhesion of the putty paste. Further repair is carried out as described in previous section.