How It's Made Season 8 Episode 10 Handcuffs, Caulking and Joint Compound, Propane Tanks, Forensic Facial Reconstruction ( Air Date 2007-03-13 ) Genre Documentary category. Overview "Hardened metal components are forged and assembled into handcuffs, chemical ingredients are blended into caulking and joint compound, steel cylinders are formed and tested as propane tanks, and anatomical evidence is used to reconstruct a person’s facial appearance.".