wherein the neck portion is disposed between the first and second portions, the neck portion having a transverse width smaller than a transverse width of {HEAD ~ the second portion} to permit insertion and {TAIL ~ removal} of the tool 
to permit
wherein the neck portion is disposed between the first and second portions , the neck portion having a transverse width smaller than a transverse width of { HEAD ~ the second portion } to permit insertion and { TAIL ~ removal } of the tool
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH