Step 6: Drill Countersinks Into the Assembly

Drill Countersinks Into the Assembly to Build an Address Plaque Post
Photo: Anthony Tieuli
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Using a -inch countersink bit, drill three evenly spaced countersinks about ¼ inch deep on each side of the short board, for attaching the corbel assembly to the mailbox post.
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    Tools List

    • 30-foot tape measure
      Measuring tape
    • miter saw
      Miter saw
    • drill
      Drill/driver
    • Drill bit
      Drill bit
    • Countersink bit
      Countersink bit
    • Lag-screw driver bit
      Lag-screw driver bit
    • caulk gun
      Caulk gun

    Shopping List

    One 6-inch hollow paneled mailbox post designed to fit over a 4x4 post

    1 urethane decorative outdoor-grade corbel

    1 urethane decorative outdoor-grade finial

    1 metal address plaque

    One 8-foot 1x6 cellular PVC board, to pad out the corbel

    Polyurethane construction adhesive

    1¼-inch exterior screws

    2¼-inch exterior screws

    Paintable caulk

    Acrylic paint

    Screw eyes

    2 S-hooks

    1 ground screw (with rebar and lag bolts)

    One 8-foot 4x4 pressure-treated post