can ironing die members for use in a tool pack assembly which is part of a can body making apparatus used in forming cups into can bodies and wherein each can ironing die member is mounted in a fixedly mounted holding member so that the can ironing die member can be moved in radial directions by the cup from an initial location to a new location if the longitudinal axes of the cup and the can ironing die member are not in alignment and retaining apparatus for retaining the can ironing die member at the new location until moved again by an out of alignment cup . also , the can ironing die member can be rotated relative to the holding member .