An apparatus is disclosed. The apparatus includes a first operating table column member, a second operating table column member that is movable relative to the first operating table member in a longitudinal direction, and a slide member that is attached to an inner surface of the first operating table column member, the slide member having a slide surface. The slide surface is slidably mounted on an outer surface of the second operating table column member, the outer surface of the second operating table column member facing the inner surface of the first operating table column member. A curable sealing compound is disposed in a space between the slide surface of the slide member and the inner surface of the first operating table column member.