With the help of specially curved steel rods, the dents were pushed punctually from the back of the sheet out. To find the exact point on the opposite side of the dent at work, special lamps, shields or plates are used. These tools project a reflection of parallel lines on the paint of the vehicle. If the reflection of the parallel lines are placed over the dent, then distortions reveal. Gently and selective pressures on the back of the dent, it is pushed back until the lines run parallel again.