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