I took my previous my structure from my first car and modified it. I knew what the errors were I just needed to figure out a good way to fix them. I looked at the materials that I could use and decided what the best plan would be. I knew that I needed to attach my wheels better so I took them right off. I made a new attachment for my axle so that the string wouldn't get caught and cause it to turn.I also realize that the string would need to not be attached straight to the buffet so instead I put two chopstick like objects and glue them onto one side of the lever. I then took my wheels and glued them on this time so that they would stay on longer. I also then put rubber bands around the wheels to add friction. Put rubber bands around the wheels add friction.and lastly I took off the piece of wood that I had put as the base below the mousetrap. I realize there was no point in having this and it was just weighing me down. And lastly I took off the piece of wood that I had put as the base below the mousetrap. I realize there was no point in having this and it was just weighing me