Abstract: An apparatus for assembling a cable drum having a winding drum and flange plates with ribs mounted on the ends thereof. The apparatus comprises a pair of pressing plates, each pressing plate having mounting grooves for engaging the ribs on the flange plates, the pressing plates being positioned to face one another with the centers aligned on a central axis, wherein the pressing plates are movable in the axial direction with respect to one another. An annular holder engages the winding drum and positions the winding drum such that the axis thereof is aligned with the center axis of the pressing plates, wherein the annular holder includes at least two segment members, the segment members being movable with respect to one another.