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