One or more metal tubes passes through {HEAD ~ the holes} of the plates to position the plates with their second portions forming {TAIL ~ a substantially continuous sheet} 
One or more metal tubes passes through { HEAD ~ the holes } of the plates to position the plates with their second portions forming { TAIL ~ a substantially continuous sheet }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL