piercing {HEAD ~ at least two transversely spaced apertures} in {TAIL ~ an elongated sheet} of heat conducting, deformable material 
in
piercing { HEAD ~ at least two transversely spaced apertures } in { TAIL ~ an elongated sheet } of heat conducting , deformable material
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH