The header can have {HEAD ~ a thickness} substantially less than {TAIL ~ the probe diameter} and can comprise a flange about an edge of the header 
substantially less than
The header can have { HEAD ~ a thickness } substantially less than { TAIL ~ the probe diameter } and can comprise a flange about an edge of the header
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH