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