The inwardly facing surface comprises the means for simultaneously drawing the plurality of {HEAD ~ sleeves} through {TAIL ~ the duct} 
through
The inwardly facing surface comprises the means for simultaneously drawing the plurality of { HEAD ~ sleeves } through { TAIL ~ the duct }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL