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