Tetherball is a fun and simple game where two people try to hit and wrap a ball on a string around a central pole. Building your own, semi-portable tetherball pole takes less than an hour, plus time for the concrete to dry.
Build the Pole
Drill a hole 1 inch deep at the center of one end of the pole. Use a drill bit 1/8-inch narrower than the diameter of the shaft of your eye screw.
Hand-screw the eye screw into the hole you just drilled until you can no longer turn it by hand.
Slide the screwdriver shaft through the hole in your eye screw. Use the leverage of the screwdriver to screw it into the pole until the bottom of the eye hole is flush against the top of your pole.
Use the carabiners on each end of your tetherball cord to attach the cord to the ball on one end and the eye screw on the other.
Mix your concrete and water in the bucket according to the instructions that came with the concrete. Stir with your stir stick until the concrete is of uniform consistency, about the same as thick porridge.
Flatten your cardboard box. Set your tire flat on the cardboard so that the entire bottom hole is covered with cardboard.
Set your pole on end, centered in the middle of the hole in your tire. Check to make certain the pole is exactly perpendicular to the ground.
Pour the concrete into the hole of the tire, filling it until it's level with the top of the hold. Again, check periodically to keep the pole perpendicular.
Check and adjust the pole as the concrete dries. Once it has set, the pole is in position forever.
Remove the cardboard once the concrete has dried.