stopper 22 e into the vicinity of the projection 21 e serves for guiding the spring sides 10 e and continues via a ledge 25 e in the surface 26 e as already mentioned the combination of the ledges 25 e with the ledges 15 e on the inner sides of the spring sides 10 e gives rise to a security against loss whereby this is intended to prevent the bowden side component 2 e slipping unintentionally out of the component 1 e on the casing side fig6 a to 6 e show an additional embodiment of the invention this embodiment uses a component 1 f on the casing side which on the one hand can be connected via the coupling area 14 f to a case not illustrated and which on the other hand has an elastically deforming area 10 f with an essentially cylinder casing like contour the area 10 f is provided with recesses 11 u2032 f which are limited by the projection 12 f provided for supporting the spring 3 and by a closed ring 11 f whereby the inner surface of the ring 11 f limiting the recess 11 u2032 f functions as a friction locking component for engaging the friction locking component 23 f of the component 2 f on the bowden side the friction locking component 23 f is formed as a hook like projection on the stopper 22 f before the connection of the two components 1 f and 2 f the spring 3 must be pushed away from the areas of the friction locking components 11 f 23 f in order to allow the elastic deformations necessary for the connection upon.