The device is operable by a single roofer, rather than requiring {HEAD ~ one person} to distribute {TAIL ~ the plates} and another to secure the plates in place 
to distribute
The device is operable by a single roofer , rather than requiring { HEAD ~ one person } to distribute { TAIL ~ the plates } and another to secure the plates in place
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH