Abstract: A method and a device for producing containers formed by pneumatic or hydraulic pressure (i.e. blowing pressure or the pressure of a fluid to be filled) from preforms with a blow mold are provided. The blow mold has a bottom mold with an axially displaceable bottom die, wherein for exerting a counterforce on the bottom die is configured to bias the bottom die into an extended position being arranged in the interior of the blow mold and being extended from the bottom mold, wherein the stretching rod is configured to displace the bottom die against the counterforce into a retracted position substantially being arranged in the bottom mold. The counterforce clamps the preform stretched by the stretching rod between the tip of the stretching rod and the bottom die so that the container being formed is always kept centered.