The barrier is furthermore spaced radially away from the central portion or stem of the insulator over {HEAD ~ at least a substantial part} of {TAIL ~ the inner periphery} of the barrier 
of
The barrier is furthermore spaced radially away from the central portion or stem of the insulator over { HEAD ~ at least a substantial part } of { TAIL ~ the inner periphery } of the barrier
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH