5 within the housing 2 brought about for example through axial play of the actuating shaft 5 in the housing 2 due to tolerances a spring elastic element 21 is arranged in the housing interior 3 which preloads the control lever 4 and thus also the actuating shaft 5 that is fixed on the control lever 4 in a rotationally fixed manner towards the first housing wall 7 a to this end the spring elastic element 21 supports itself on the one end on the second housing wall 7 b and on the other end on the control lever 4 as is schematically shown in fig2 the spring elastic element 21 can be or comprise a coil spring 22 which is arranged coaxially to the centre longitudinal axis m of the actuating shaft and radially wraps the actuating shaft 5 on the outside in variants of the example a suitable spiral spring wave spring or disc spring can also be used instead of a coil spring with a further version of the example of fig1 shown in fig3 the recess 10 provided in the second housing wall 7 b is also designed in the form of a passage opening 23 such a passage opening 23 has a first opening diameter d 1 in a first axial section 24 a facing.