compressing the protruding end of the hollow tubular heat pipe via the pointed extruding shaft to render the protruding end of the heat pipe to be depressed inward into inside of the hollow tubular heat pipe, thereby obtaining {HEAD ~ the hollow tubular heat pipe} having {TAIL ~ a concaved end surface} 
having
compressing the protruding end of the hollow tubular heat pipe via the pointed extruding shaft to render the protruding end of the heat pipe to be depressed inward into inside of the hollow tubular heat pipe , thereby obtaining { HEAD ~ the hollow tubular heat pipe } having { TAIL ~ a concaved end 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 OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL