Things You'll Need
Instructions
Cut two pieces of plywood, 17 inches by 17 inches each.
Cut four planks of 2-by-4, each 17 inches long, and four planks of 2-by-4, each 14 inches long.
Arrange the eight planks into two squares, with a pair of 14-inch planks situated between a pair of 17-inch planks in each square, and secure in place with eight screws into each box.
Place a square of plywood atop each plank square and secure in place with screws through the wood into the sides of the planks.
Cut two pieces of PVC pipe, each 3 1/2 inches long.
Glue one pipe piece into the center of each wood box.
Paint the washers with all-weather matte finish paint. Use two colors, with three washers of each color.