Rotational element and compressor assembly comprising such a rotational element

A rotational element, such as a shaft or other rotational part of a device such as a motor or compressor, which is intended for being driven for a rotational movement by means of a driving device or for forming a part of such a driving device, which rotational element is internally provided with at least one annular cavity which separates a central part from an outer part of the rotational element, wherein the outer part is provided with one or more holes or channels which extend from an outer wall of the outer part to the annular cavity and wherein in the holes or channels fixation means are fixedly mounted which each extend through the corresponding hole or channel and which have a tip which is abutting against the central part.