Assemble the wooden stool by turning the round seat upside down with holes facing up. Coat the bottom of each hole with wood glue. Place wooden legs into the holes. Some kits will have screws for added stability and wooden cross bars. Allow the glue to dry for 24 hours.
Saw the wooden log in half vertically. Each half will have a rounded hump on the outside of bark and a flat surface of wood grain. Lay the flat side of one of the log halves down on top of the bar stool. From the underneath side of the stool, insert furniture screws up through the seat and into the four corners of the log using the drill with a screwdriver tip.
Coat the top of the wooden log with a ¼-inch-thick layer of wood glue. Place the saddle over the top of the hump created by the log and press firmly. Once an hour for the next six hours, press the saddle down to make sure the underside of the saddle is in contact with the wood log and to create a tight seal between the two.
Set the stool aside and allow to set for the amount of time indicated on the glue's bottle. Different brands of wood glue vary in drying time, and local humidity can also impact the length of time glue takes to dry. Once the glue is completely dry, your stool is ready to use.