The outer edge portion 7 is mounted on {HEAD ~ the cylindrical portion} 1A of {TAIL ~ the casing} 1 through bolts  
of
The outer edge portion 7 is mounted on { HEAD ~ the cylindrical portion } 1A of { TAIL ~ the casing } 1 through bolts
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH