Moving {HEAD ~ the receptor fins} controls {TAIL ~ the extent} of interleave thereof with the radiator fins, so as to control temperature of the mandrel 
Moving { HEAD ~ the receptor fins } controls { TAIL ~ the extent } of interleave thereof with the radiator fins , so as to control temperature of the mandrel
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH