As described above, the longitudinal axis of {TAIL ~ the glass core} 20 is substantially centered with respect to the exterior surface 54 on {HEAD ~ the second sleeve} 50 
As described above , the longitudinal axis of { TAIL ~ the glass core } 20 is substantially centered with respect to the exterior surface 54 on { HEAD ~ the second sleeve } 50
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH