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