At a predetermined time interval following {HEAD ~ the return} of {TAIL ~ the first diversion rod}, the interval dependant upon the desired degree of buckling, the second diversion rod is moved in the direction opposite of that traveled by the first, i.e., toward the secondary extrudate, until the primary extrudate either contacts and is caused to bond, or comes in close proximity, with the secondary extrudate 
At a predetermined time interval following { HEAD ~ the return } of { TAIL ~ the first diversion rod } , the interval dependant upon the desired degree of buckling , the second diversion rod is moved in the direction opposite of that traveled by the first , i.e. , toward the secondary extrudate , until the primary extrudate either contacts and is caused to bond , or comes in close proximity , with the secondary extrudate
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