More specifically, {HEAD ~ the tube section} 20 has at each of its ends {TAIL ~ a flange} 20a which can be tightly fixed to the flanges 12a and 10a by any appropriate fixing means, such as not shown bolts 
has
More specifically , { HEAD ~ the tube section } 20 has at each of its ends { TAIL ~ a flange } 20a which can be tightly fixed to the flanges 12a and 10a by any appropriate fixing means , such as not shown bolts
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH