A weakened zone of said tube section is automatically broken during {HEAD ~ lift} off by {TAIL ~ a mechanism} applying a tensile stress to the section 
off by
A weakened zone of said tube section is automatically broken during { HEAD ~ lift } off by { TAIL ~ a mechanism } applying a tensile stress to the section
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH