In some circumstances, the bending step of FIG 4 may result in a partially open seam such as that indicated at 66 between {TAIL ~ the edges} of {HEAD ~ the extensions} 
In some circumstances , the bending step of FIG 4 may result in a partially open seam such as that indicated at 66 between { TAIL ~ the edges } of { HEAD ~ the extensions }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD