The surface of the casing on which the fitting means 24 is exposed is not limited to {TAIL ~ the outer surface} of {HEAD ~ the casing} 
The surface of the casing on which the fitting means 24 is exposed is not limited to { TAIL ~ the outer surface } of { HEAD ~ the casing }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD