An apparatus for forming a two-piece can comprising: a cylindrical housing, the cylindrical housing having a first end and a second end; a first round bushing having a longitudinal rectangular bore and received in the first end; a second round bushing having a longitudinal rectangular bore and received in the second end; a substantially cornerless rectangular ram which slides in the longitudinal rectangular bore of the first round bushing and the longitudinal rectangular bore of the second round bushing; a spring interposed between the first round bushing and the second round bushing and surrounding the substantially rectangular ram.