Abstract: The invention relates to securing hanging-loops to cathode starting sheets and an assembly machine is disclosed which comprises a turntable having five circumferentially spaced, flat, tables the surface of each of which is substantially vertical, indexing means for indexing the turntable about the vertical axis through a sheet loading station, a loop strip loading station, a loop-rivetting station and an assembled-sheet-removal station, a sheet loading mechanism at the loading station, a loop strip loading mechanism the loop-strip loading station, a loop strip bending mechanism and a loop-rivetting mechanism at the loop-rivetting station, and a finished-sheet-removal mechanism at the assembled-sheet-removal station.