Small bulges can be straightened with a straightening hammer and a hand anvil. If there are corrosion holes in the body, it is recommended to replace the part as a set or weld a tin plate depending on the size of the damage.
Small bulges should be straightened with a straightening hammer, resting against the part from the opposite side with a hand anvil. Do not hit the hammer too hard, since otherwise the sheet metal will expand and cease to be smooth. Straightening should be carried out by moving evenly from the edges to the middle.
Always check the straightened surfaces by hand to find out whether the required shape has been achieved. Small irregularities are later primed. After straightening, carefully remove rust and remnants of old varnish from the repaired surface. This is done either with coarse sandpaper (grain size 120), stretched over a grinding wheel, or grinding plates on a convex disk. The pads and plastic parts located near the damage should be covered with adhesive tape to avoid accidental scratches when the tool slips.