Molded part for a nozzle core, nozzle core and stuff-crimping device for crimping, expansion kit, locking device and setting element as well as method therefor

A nozzle core including at least a first and a second molded part,

• said molded part each including:
• a ceramic body with a planar surface,
• wherein a cavity is arranged in the planar surface for forming part of a nozzle,
• wherein receiving contours are arranged in the planar surface for receiving fastening means, which receiving contours are arranged laterally with reference to the cavity,
• wherein the receiving contours are open in the lateral direction, such that the molded part is fastenable on a counter piece without the fastening means having to be removed from the counter piece,
• wherein the planar surface of the first molded part is configured on the planar surface of the second molded part, and wherein the respective cavities form a nozzle duct with an inlet and an outlet.