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