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