Hey.   so it finally worked, and i didnt have to buy  a heatgun.   1. I got rid of the return edge  2. Applied some boiling water to the areas, to heat it up a bit. 3. Kept in the desired shape with some wood and fasteners. 4. Then i poured about 1 Liter of boiling water slowely on each side. 5. Let it cool down for roughly 2 hours.   the back plate has the perfect shape now. I might have to add a little gab between the kidney plate and the back
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