1. Put the balloon into a plastic bottle. Pull out of the mouth of the balloon plastic bottle strap tightly at the bottle mouth (notice by the picture below).
2 small hole at the bottom of the bottle, plastic. (for the tube to fit).
3. Close the small holes with scotch tape.
4. Blowing balloons, and leave it for a moment. The balloons are the same, no sag.
5. Sheep scotch tape bottom out the balloons will shrink. Tube in tube then the inflatable plug.