An apparatus including a first body part and a second body part slidingly movable in relation to each other from a compact position to an extended position, a housing configured to receive a replaceable internal part, and a joint mechanism joining the first and second body parts to a third part of the apparatus. The joint mechanism is configured to allow, when the apparatus is in said extended position, the first and second body parts to tilt in relation to said third body part to provide access to the housing.