Devices are disclosed for forming egg-yolk disks by wire-cutting egg-yolk material extruded from a main cylinder. The main cylinder ends to an extrusion-head. The extrusion head may be threaded on a cylinder to a desired degree, so that during the disk-cutting process, the cutting wire slides on the front surface of the extrusion head. The Devices may also have a mechanism for locking the extrusion head in position. Miscellaneous mechanisms for wetting the cutting wire are also disclosed.