40 of the housing halves of the cartridge 15 project as transverse ribs 41 into the groove 39 with this formlocking connection the floor 28 becomes flush with the surface of the support wall 27 thus the cartridge 15 is securely seated on the telescoping housing part 23 the bridging part of the retaining clip 25 leaves a sufficient transverse slot 42 for insertion in of the mouthpiece cross section whether it is formed as a twin tube or as a single tube as can be seen in fig1 the telescoping housing parts 22 23 are connected with a lever transmission system allowing telescoping at moderate force it can be seen that this is an indirect connection it is effected using a ring member 42 the ring member 42 extends facing away from the receptacle 26 in the back of the support wall 27 of the dispenser 1 the ring member 42 is axially displaceable the clip ends of the retaining clip 25 of the telescoping housing part 22 are fixedly secured to the ring member 42 the fastening point can be identified by a rivet 43 in order to provide insight into the assembly the ring member 42 is broken away in the central region the connection of the telescoping housing part 22 with the telescoping housing part 23 is effected by crossing each other double arm levers 44 their longer arm a running transverse to the direction of operation arrow x engages via an articulation 45 the rear wall 33 of the upper housing part 24 from the rear wall 33 mounting blocks 46 project into the receiving space of the lever 44 the articulation 45 forms on the lever side longitudinal openings 47 as movement compensation the end segments.