{HEAD ~ Free ends} of roving protrude from {TAIL ~ borehole openings} and are splayed apart into individual filaments  
protrude from
{ HEAD ~ Free ends } of roving protrude from { TAIL ~ borehole openings } and are splayed apart into individual filaments
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH