In the embodiment shown, the form has an area of diminished width to aid {HEAD ~ cutting} of the probe shaft at {TAIL ~ the outside perimeter} of the form  
at
In the embodiment shown , the form has an area of diminished width to aid { HEAD ~ cutting } of the probe shaft at { TAIL ~ the outside perimeter } of the form
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH