Therefore a large amount of {HEAD ~ fasteners} consistently supplied to {TAIL ~ the fastening machines} in proper orientation is required 
consistently supplied to
Therefore a large amount of { HEAD ~ fasteners } consistently supplied to { TAIL ~ the fastening machines } in proper orientation is required
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH