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