The invention relates to a method of crimping a first flange (1a) of a first part (1) and a second flange (2a) of a second part (2) to form an assembly (3) . The second flange (2a) comprises a flap (7) intended to be folded over the first flange (1a). The first rim (1a) has a notch (4). The crimping process includes a step of placing an insert (5) inside the notch (4).
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