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 the second portion to permit insertion and {HEAD ~ removal} of {TAIL ~ the tool} 
of
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 the second portion to permit insertion and { HEAD ~ removal } of { TAIL ~ 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 OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL