Cut one 2 x 4 about 32 inches. This is the long base pole of the slingshot. Cut two 1 foot pieces of 2 x 4. These will be the two arms of the slingshot. Cut two 22 inch pieces of 1 x 4. Attach the two 1x4 pieces to either side of the 32 inch long 2 x 4 at a 90 degree angle. I used 8 D nails. Slide a 1 foot section of 2 x 4 on each side of the arm (between the 1 x 4s). Attach using 8 D nails. Drill a 3/8 inch hole in the center of each arm about 3 inches from the top of each arm. This is where rubber tubing will be attached.