to fig1 and 12 the upper cap 46 is brought down upon the lower insert 70 as the force acting on the upper cap 46 is increased the lower insert 70 along with the container end closure 2 is brought to bear onto the outer surface 82 of the lower retainer 74 this abutting relationship deflects the inner panel wall 26 outwardly as shown the upper cap 46 will also help maintain 1 the radius between the central panel 34 and the inner panel wall 26 about 0 015 inches in fig5 2 the angle of the outer panel wall 22 about 13 u00b0 in fig5 and 3 the curl height about 0 186 inches in fig5 furthermore the lower key ring 54 includes an inner profile 94 that creates the distinct transition between the countersink and the outer panel wall as shown as the inner panel wall 26 and associated countersink 30 is forced outwardly the outer panel wall 22 is brought to bear against the profile 94 of the lower key ring 54 to create the outwardly deflected outer panel wall 22 deflecting the countersink 30 outwardly also reduces the countersink radius in one embodiment the countersink radius is reduced from 0 015 inches to about 0 010 inches the lower key ring 54.