The fingers are movable between a retracted position for {TAIL ~ insertion} into {HEAD ~ a bag} and an extended position in which they can overlap the outer surfaces adjacent to each carton corner 
The fingers are movable between a retracted position for { TAIL ~ insertion } into { HEAD ~ a bag } and an extended position in which they can overlap the outer surfaces adjacent to each carton corner
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH