Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to adapt a mousetrap car for speed [title] Shorten the lever arm. [step] Installing a shorter lever arm is the best way to adapt a racer for speed. However, if the lever is too short, it will spin out.

Ending1: Which is why you should always shorten it regularly. [title] Remove the top portion of the gasket. Ending2: There is no precise formula for how long the lever should be. Experiment to see how short you can get the lever while maintaining control of the car. Ending3: Switching to a longer lever arm might make the challenge more challenging. You also want a more stable vehicle so that the indicator light continues to illuminate. Ending4: The throttle arm should now be covered by the rear bumper. Keep in mind, the shut-off valves will not allow the release of the gear shift when switching gears or cycling.

Answer format: ending1/ending2/ending3/ending4