section near the end of the hollow threaded spindle 3 means are provided for its fixed connection to the housing 1 in the version shown this is the other part 32 of the aforementioned bayonet lock this two piece bayonet lock 13 32 makes an interlocking form fit connection between the housing 1 and the hollow threaded spindle possible 3 preferably the bayonet lock 13 32 is provided with one sided hooks that prevent a severing of the connection without special tools a tight axial bore 33 is located in the hollow threaded spindle 3 to accommodate the traction rope 5 to support the end of the bowden tube 6 the hollow threaded spindle 3 is provided with a short recessed axial bore 34 into which the end of the bowden tube 6 protrudes after installation the threaded bushing 4 features an essentially cylindrical segment 41 particularly as shown in fig3 and 5 an axial bore 42 to accommodate the hollow threaded spindle 3 protrudes from one side and from one end into the threaded bushing 4 and initially continues in the area of the opposite end as a tight bore to accommodate the traction rope 5 and then widens to the diameter to accommodate the bowden tube 6 the nut thread 421 fitting the exterior thread 31 of the hollow threaded spindle 3 is formed in at least one front section of the bore 42 in addition flexible.