Use a jigsaw to cut a piece of 3/4-inch wood, such as oak or maple, into a circle that is the same size as the largest part of the base of your television. For instance, if your TV's base is 24 inches wide and 12 inches deep, cut a circle that is 24 inches wide in diameter. Cut a second piece of wood into a circle that is 2 inches larger than the first circle.
Screw one side of a lazy Susan bearing onto the center of the smaller piece of wood, with the flat side of the bearing against the wood, using 3/4-inch wood screws. Use a bearing that is about half the size of the larger circle of wood.
Turn the unfastened side of the lazy Susan bearing 90 degrees. Using a pencil, mark the wood through the four screw holes in the bearing.
Drill four holes completely through the smaller piece of wood where you made the marks. Use a drill bit that creates a hole that is large enough for your screw to fit through.
Place the larger piece of wood flat on the table. Put the smaller piece of wood on top of it, with the lazy Susan bearing centered between the two pieces. The larger piece of wood should extend past the smaller piece by 1 inch all around, if it is centered correctly.
Line up the unfastened end of the lazy Susan bearing screw holes with the holes you made in the smaller piece of wood. Feed a screw through the wood hole and the bearing hole, and screw it into the larger piece of wood. Repeat this until all four bearing corners have been screwed in place.
Fill the holes in the base with wood putty. Fasten rubber feet to the outside bottom of the smaller piece of wood to add stability, if needed.