The compressible polyurethane layer having outer and inner surfaces on or for rotation-symmetrical bodies consists of polyurethane and contains expanded andor non-expanded, but expandable thermoplastic hollow spheres. The first load sensing device receives a brake signal from the brake control valve and provides a first braking signal for loads above a first value. It further comprises a sensing arrangement adapted to detect an event related to the insertion by a user of a capsule andor the presence of the capsule on or into the positioner.