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