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 {HEAD ~ the movement} of {TAIL ~ the piston} 54 from its extended position to its retracted position 
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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 { HEAD ~ the movement } of { TAIL ~ the piston } 54 from its extended position to its retracted position
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