At a predetermined time interval following the return of the first diversion rod, {HEAD ~ the interval} dependant upon {TAIL ~ 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 
dependant upon
At a predetermined time interval following the return of the first diversion rod , { HEAD ~ the interval } dependant upon { TAIL ~ 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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