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