Still another advantage of the invention is that {HEAD ~ the end} of the core is securely held by the two sleeves and will not move back and forth during polishing thereby allowing the end of {TAIL ~ the core} to be polished to a flat surface 
Still another advantage of the invention is that { HEAD ~ the end } of the core is securely held by the two sleeves and will not move back and forth during polishing thereby allowing the end of { TAIL ~ the core } to be polished to a flat surface
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH