in the case of a bent connecting rod 19 in a portion as illustrated in fig3 a the present invention provides a connecting rod in two portions connected together by suitably selected attachment means so as to give certain flexibility to the assembly with which it is possible to facilitate alignment of the different pivot points of the connecting rod in particular during all the phases for displacing moveable parts such a connecting rod is illustrated in fig4 to 7 b a bent connecting rod in two portions 31 may ideally include a first connecting rod member or body 33 intended to be mounted to a moveable panel 3 of a secondary nozzle through the first pivot point or pivot point of the connecting rod body 35 into which is embedded a second connecting rod member or foot 37 intended to be mounted to the fixed structure 9 see fig4 through the second pivot point or connecting rod foot pivot point 38 both members 33 37 are connected together by the self aligning means 39 a and 39 b so that the foot 37 and the body 33 are attached to each other while retaining a certain freedom of displacement relatively to each other the self aligning means 39 a and 39 b are positioned between the connecting rod foot pivot point.