A fixing device as specified in this disclosure shall comprise a fixing head, a shaft which is derived from the fixing head, and at least one wing element which is movably coupled to the shaft. The shaft extends along a middle axis and the wing element is rotatable around a pivoting axis that extends parallel to the middle axis. The wing element can be rotated between a stowed position and a used position. The wing element has a fork that is configured to include a workpiece in it when it is in the position used.
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