Mousetrap Powered Car

This way  to add traction to a wheel :

1. Cut out the middle section of a balloon

2. Stretch the section around the wheel as shown. ---->

->>>>>>>
The length of the string must not be longer than the length from the tip of the handle arm to the axle hook.
Balance the wheels so that the wheels do not vibrate when moving.
You may change the large DVD wheels to smaller wheels to improve the start-up speed.
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