Abstract: A cylindrical metal barrel is joined to the heads or closures on opposite ends by the bending together of the annular material of the head and respective barrel end to form the usual double seam made by seamer rolls brought to engagement by means of cams. The metal barrels are supported between movable heads on which are mounted respective barrel chucks driven by respective and individual chuck spindles driven from a respective motor and clutch drive on each head. A power take-off operates a common drive shaft between the heads which has the actuating cams thereon that vertically move the seaming rolls. Thus, there is independent operation at each end of the barrel on each head for making each respective double seam.