Basic tools for this assembly are a 3/8 allen wrench, a threaded insert and a hanger bolt and crescent wrench.

Drill a 3/8 hole in the bottom of your furniture piece.

Screw the threaded insert into the bottom of your piece using the allen wrench.

Drill a ¼ hole in the top of the bun foot using a drill press or being careful to be sure hole is 90 degrees to wood surface.

Attach the hanger bolt to the bun foot using a crescent wrench. In this picture a nut has been tightened against a seccond so that when they are tightened, the hanger bolt is driven into the bun foot.

Simply screw the bun foot into the bottom of your piece.