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bits are standard drill bits, paddle bits and brad point bits.
For this application any of these bits would work equally well.
The first step is to drill a 1/4 wide hole through the bottom
of your bun foot; where the bottom of the hole is 1” from
the top of the bun foot leaving 1” of material between the
flat surface and the bottom of the hole.
A second 1/8 wide hole will be drilled through the remainder of
the bun foot. In this situation we are using 2 ½”
#8 screws. The screws will drive into your piece nearly 1 ¾”
allowing for some compression. If the bottom of your piece is
less than 1 ¼” thick you may want to use a shorter
screw.
Using a drill with a square drive screw the 2 ½
#8 screw through the bun foot into the piece.