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