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