Method for producing a final assembly comprising at least two layers (C1, C2) comprising an inner layer C1 composed of C1'>1 helically wound metallic filamentary elements and an outer layer C2 composed of C2'>1 metallic filamentary elements helically wound around the inner layer C1, characterized in that the method comprises: - a step of providing a temporary assembly comprising at least two layers (A1, A2) comprising an inner layer A1 composed of A1'>1 metallic filamentary elements helically wound around a temporary core and an outer layer A2 composed of A2'>1 metallic filamentary elements helically wound around the inner layer A1, - a step of separating the temporary assembly between at least: ∘ a first split assembly comprising at least one layer D1 composed of D1'≥1 helically wound metallic filamentary element(s), the D1' metallic filamentary element(s) being derived from the inner layer A1 composed of A1'>1 metallic filamentary elements of the temporary assembly, ∘ a second split assembly comprising at least one layer composed of E2'≥1 helically wound metallic filamentary element(s), the E2' metallic filamentary element(s) being derived from the outer layer A2 composed of A2'>1 metallic filamentary elements of the temporary assembly, ∘ a third split assembly comprising at least one layer F2 composed of F2'≥1 helically wound metallic filamentary element(s), the F2' metallic filamentary element(s) being derived from the outer layer A2 composed of A2'>1 metallic filamentary elements of the temporary assembly, ∘ the temporary core or one or more assemblages comprising the temporary core, the method comprising a step of reassembling at least the first split assembly, the second split assembly and the third split assembly to form the final assembly. - a step of providing a temporary assembly comprising at least two layers (A1, A2) comprising an inner layer A1 composed of A1'>1 metallic filamentary elements helically wound around a temporary core and an outer layer A2 composed of A2'>1 metallic filamentary elements helically wound around the inner layer A1, - a step of separating the temporary assembly between at least: ∘ a first split assembly comprising at least one layer D1 composed of D1'≥1 helically wound metallic filamentary element(s), the D1' metallic filamentary element(s) being derived from the inner layer A1 composed of A1'>1 metallic filamentary elements of the temporary assembly, ∘ a second split assembly comprising at least one layer composed of E2'≥1 helically wound metallic filamentary element(s), the E2' metallic filamentary element(s) being derived from the outer layer A2 composed of A2'>1 metallic filamentary elements of the temporary assembly, ∘ a third split assembly comprising at least one layer F2 composed of F2'≥1 helically wound metallic filamentary element(s), the F2' metallic filamentary element(s) being derived from the outer layer A2 composed of A2'>1 metallic filamentary elements of the temporary assembly, ∘ the temporary core or one or more assemblages comprising the temporary core, the method comprising a step of reassembling at least the first split assembly, the second split assembly and the third split assembly to form the final assembly. ∘ a first split assembly comprising at least one layer D1 composed of D1'≥1 helically wound metallic filamentary element(s), the D1' metallic filamentary element(s) being derived from the inner layer A1 composed of A1'>1 metallic filamentary elements of the temporary assembly, ∘ a second split assembly comprising at least one layer composed of E2'≥1 helically wound metallic filamentary element(s), the E2' metallic filamentary element(s) being derived from the outer layer A2 composed of A2'>1 metallic filamentary elements of the temporary assembly, ∘ a third split assembly comprising at least one layer F2 composed of F2'≥1 helically wound metallic filamentary element(s), the F2' metallic filamentary element(s) being derived from the outer layer A2 composed of A2'>1 metallic filamentary elements of the temporary assembly, ∘ the temporary core or one or more assemblages comprising the temporary core,