From the perspective of an expert on construction
1) It is impossible to bend sheet metal back, if not exert pressure on the opposite side. If you knock on the front side - just corrupt the paint.
2) Or, drilled small holes in the steel wire that passes and try to pull the bulge back. The wire is attached with the front side with a steel ball or do loop, which pass through a very brief piece of steel wire. If you pull a solid, relatively thick wire (1 mm), then bends her end of the L-shaped 2-3 mm. Or use the corresponding L-shaped tool. Is that clear?
This method provides no guarantees of full alignment, will necessarily uneven, but the smaller size. In the process of extraction can be damaged paint a diameter of several mm. from the hole. Hole-mask will restore.
3) I have carefully removed fragmented paint layer. Then he would calmly arched sheet and stuck a piece back.
Question: Judging by the photo, work has already been decimated. If it will be fully restarirovat, redraw - the loss of even one small piece is almost invisible. Is there any historical value of the sheet metal? It may be easier to draw a new picture, and leave it as a sample?
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