A container includes an end wall having a rivet and a frangible score line that defines a curved tongue shaped panel. The frangible score line terminates at each end substantially on a radial line extending from a lever mounting hole formed within the curved tongue shaped panel. A tab is riveted to the lever-mounting hole to act as second-degree lever. The tab has a first actuating point extending toward the distal looping portion of the frangible score line. The tab has a fulcrum portion extending opposite to the first actuating point and terminating within the curved tongue shape. Lifting of the first actuating point pulls upward on the curved tongue shaped panel at the distal looping portion imparts a shear force of the frangible score line to initiate upward rolling of an extended portion of the curved tongue shaped panel.

A container includes an end wall having a rivet and a frangible score line that defines a curved tongue shaped panel. The frangible score line terminates at each end substantially on a radial line extending from a lever mounting hole formed within the curved tongue shaped panel. A tab is riveted to the lever-mounting hole to act as second-degree lever. The tab has a first actuating point extending toward the distal looping portion of the frangible score line. The tab has a fulcrum portion extending opposite to the first actuating point and terminating within the curved tongue shape. Lifting of the first actuating point pulls upward on the curved tongue shaped panel at the distal looping portion imparts a shear force of the frangible score line to initiate upward rolling of an extended portion of the curved tongue shaped panel.