An apparatus for forming plastic pre-forms into containers with a blow mold which has at least two movable blow mold parts which, when closed form a container-forming cavity. The first blow mold part is removably arranged on a first blow mold carrier shell part, and the second blow mold part is removably arranged on a second blow mold carrier shell part. The first blow mold carrier shell part is movable with respect to the second blow mold carrier shell part for opening the mold. A holding device holds at least one blow mold part on the respective blow mold carrier shell part. The holding device has an actuating member extending through an opening in a wall of the blow mold carrier shell part. The actuating member is movable relative to the wall, and a first holding element for holding the blow mold part is arranged on the actuating member.