The invention concerns a handle part connectable to a guide part. The handle part is made up of a first part (14) and a second part (15). The first part is provided at its back end with an external thread (14a) and in its front part with an interaction part (14b). The second part is provided in its back parts with an internal thread (15a) and at its front end with an internal space (15b). The first part can be screwed into the second part by means of its external thread and can be assigned with different longitudinal displacement positions relative to the second part.
