Abstract: A mold has at least two primary mold parts movable in a primary direction away from each other from a closed position defining a mold cavity to an open position, and at least one secondary mold part which may be a core pin or a stripper which is movable in the secondary direction transverse to the primary direction relative to at least one of the primary mold parts. An actuator has a primary rack extending parallel to the primary direction and a secondary rack extending parallel to the secondary direction and secured to the secondary mold part. These racks have respective primary and secondary rows of teeth having substantially parallel tooth flanks inclined to the respective directions, the primary row meshing with the secondary row.