An improved double action bottom former for forming and shaping a metal can blank includes an integral cylinder housing having sidewalls forming first and second axial chambers, wherein the second axial chamber houses a piston suspension assembly for resilient positioning of a clamp ring and the first axial chamber houses a dome plug, which is resiliently positioned through use of a donut spring. In addition to serving means to bias the dome plug, the donut spring includes an interior cylindrical space defining a third axial chamber to increase the volumetric capacity of the second axial chamber for added capability in controlling the resilient positioning of the clamp ring to permit high cyclic operation of the bottom former for a sustained period of time without deleterious impact on other operating components comprising bodymaking equipment.