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