{HEAD ~ A windup/unwind mechanism} can be connected to {TAIL ~ the roll} and is capable of locking in selected positions for selecting the tension of the barrier member 
{ HEAD ~ A windup / unwind mechanism } can be connected to { TAIL ~ the roll } and is capable of locking in selected positions for selecting the tension of the barrier member
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH