The problem is that {TAIL ~ the ferrule} may be optically mismatched with {HEAD ~ the mating adapter}  
The problem is that { TAIL ~ the ferrule } may be optically mismatched with { HEAD ~ the mating adapter }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH