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