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