If your car doesn't run well, check the following points to repair it.
Are the axles or tires stuck against the body?
Are the wheels or tires bent?
Has the band lost its elasticity?
Is the band wound up too tightly?
Has the band come loose from the tire?
Is the band tangled up around the axle?
How to play
Pull the car backwards along the ground, gently
pushing down on the back wheels.
Point the car in the direction you want it to run,
let it go and watch it take off!
Be careful not to wind the band too tightly
as it may snap or come untied.
Play with it on a flat surface such as a table or the floor
(wooden floorboards work better than carpet).
Elastic-powered Duck : Assembly Instructions