4 are locked in rotation on the camshaft 11 by means of an attachment screw 12 a the attachment screw 12 a engages with its threaded section in a hollow space 26 provided with internal threads in the camshaft 11 a screw head 27 contacts a collar 28 formed on the inner casing surface of the hollow shaft 19 and charges this with a clamping force directed towards the camshaft 11 the hollow shaft 19 forwards the clamping force to the driven element 4 which is supported on the camshaft 11 for this purpose the hollow shaft 19 is provided in the shown embodiments with a step 29 so that the driven element 4 is pressed by the step 29 onto the camshaft 11 the collar 28 is advantageously formed in the axial direction in the direct surroundings of the step 29 here embodiments are imaginable in which the collar 28 is formed in the axial direction between the step 29 and the camshaft 11 or as shown in the figures on the side of the step 29 facing away from the camshaft through the construction of the collar 28 within the hollow shaft 19 in the area of the step 29 the entire screw head 27 is located within the hollow shaft 19 whereby this does not increase the axial installation length of the device 1 in comparison with an embodiment in which the screw head 27 contacts the side of the hollow shaft facing away from the camshaft in this embodiment stresses are.