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