The thickness of the hardware if surface mounted would leave too much of a gap between the split seat.

The first operation is to make a pattern to cut an inset for the hardware in the top and bottom of the split seat. At this point it is recommended to purchase the Lazy Susan hardware before making the pattern. The hardware must fit tightly into the cavity and the inset must be positioned in the center of the stool seat.

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Using the pattern you made, cut a 1/8” deep cavity for the Lazy Susan hardware in both the bottom and top seat pieces. After both cavities are cut check the fit and dry assemble the hardware into the cavities. To mount this hardware in the bottom half, position the hardware in place and secure with the mounting screws.

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In order to attach the hardware to the underside of the top half of the stool seat, you need to have an access hole for the mounting screws.

Here is the procedure to make this hole using a router.

Step 1: Determine the hole-position by measuring the distance between the mounting holes.

To set the router up to cut this access hole we will use the same circle jig that we used to cut the outside edge. We need to re-position the center to match 1/2 the diameter or the radius of the mounting screws.

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That’s it folks next is the assembly of the top to the bottom of the swivel stool seat. Screw the hardware to the bottom seat. Position the top seat over the hardware, move the access hole in the bottom seat around until it lines up with the screw hole, and attach. Swivel the base and repeat until all screws are mounted.

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