Unwind a plastic-coated paperclip until it is straightened. Lubricate the paper clip with a small amount of Vaseline.
Wedge the tip of one of the paper clip's ends into the ball's air hole. Make sure that the tip is lubricated so it does not tear the air hole. Gently rotate the paper clip until the air hole has become temporarily widened.
Detach a straw from the air canister that it came attached to. Keyboard cleaning air canisters often come equipped with detachable straws. Slide the straw into the hole. Do this quickly before the rubber hole begins to contract.
Reattach the end of the straw that is not in the hole to the air canister. Hold the ball in one hand and grip the air canister firmly in place with the other. Inject air from the air canister until the ball is re-inflated.
Remove the straw when you are finished inflating the ball. Since the straw is wider in diameter then the pump needle would be, the hole will initially be widened and it will leak air. Place a piece of tape over the hole to prevent leakage until the hole contracts again.