FIG 3 further illustrates {HEAD ~ the provision} of {TAIL ~ a notch} 90 formed by shoulders on the adjacent facing circumferential ends of the segments 80 
of
FIG 3 further illustrates { HEAD ~ the provision } of { TAIL ~ a notch } 90 formed by shoulders on the adjacent facing circumferential ends of the segments 80
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH