a reinforced elongate element comprises a core of elongate shape covered by at least one layer of composite material comprising a plurality of tapes wound at a settable winding angle around said core, each of the tapes being made using glass or carbon threads or fibers embedded in a matrix of thermoplastic resin. A control circuit 101 feeds out control signals 107-i for on-off controlling the feeding of the outputs of the corresponding bit stages of the shift register 102. A node in common between the pre-optimized design and an optimized design may be identified. A rib extends radially outwardly from and circumscribes the ring. Alternatively, the closing part is mounted resiliently via at least one spring tongue.