Since I still had the supplies for the original science fair model rocket I was going to build from scratch, I decided to go ahead and make it. However I decided for fun that I would add on another body tube which gave the rocket its extra height. In order to secure both tubes together I used a coupler, then added 4 screws on both the top and bottom section to put the two together. This worked well except in order to put the nut on the end of the screw (inside the rocket body