Step 1: Assemble the Bones

For the knocker, you'll need two replica vertebrae and a tibia (about $5 each and $20, respectively; The Bone Room). Place the smaller end of the tibia between the two vertebrae, as shown. Holding the arrangement securely, carefully drill a pilot hole (it should go through each vertebra and into the tibia) in each side.
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    Tools List

    • drill
      Drill/driver with high-speed steel bit
    • multi-bit screwdriver
    • jigsaw
      Jigsaw or other saw for cutting the mounting block

    Shopping List

    1. 2 vertebrae casts

    2. 1 tibia cast

    3. Stainless-steel trim-head screws

    4. 1x4 scrap wood for the mounting block5. Exterior paint the color of your door

    6. 1¼-inch deck screws

    7. Removable mounting tape