{HEAD ~ The threads} of the segments substantially fully engage {TAIL ~ the threads} of the bolt or hollow threaded member 
{ HEAD ~ The threads } of the segments substantially fully engage { TAIL ~ the threads } of the bolt or hollow threaded member
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH