This mechanism comprises several assemblies of links bearing on the tube section on either side of the weakened zone and a bearing surface formed in a sleeve fixed with respect to the ground and with which is in contact a protuberance formed on one of {TAIL ~ the links} of {HEAD ~ each assembly}  
This mechanism comprises several assemblies of links bearing on the tube section on either side of the weakened zone and a bearing surface formed in a sleeve fixed with respect to the ground and with which is in contact a protuberance formed on one of { TAIL ~ the links } of { HEAD ~ each assembly }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 OTH