Use appropriate safety equipment, such as goggles or a dust mask, when working with wood to prevent
sawdust from irritating the eyes or lungs. Inserting the wheels is quite simple, but be sure to check if there are small metal bits or “burrs” on the back of the shaft. These burrs can be left behind in the manufacturing process and can also cause the wheels to catch, which will reduce the speed of the car. Once the car is completed, the tests can be a good way to solve any last-minute problems before the day of the race.