After the preform is fully expanded to conform to the cavity 44, the anvil 48 is moved back along its linear path, and preferably in one motion back to its first position in response to the movement of {HEAD ~ the piston} 54 from {TAIL ~ its extended position} to its retracted position 
After the preform is fully expanded to conform to the cavity 44 , the anvil 48 is moved back along its linear path , and preferably in one motion back to its first position in response to the movement of { HEAD ~ the piston } 54 from { TAIL ~ its extended position } to its retracted position
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