rear springs.....

[teamorsum96]

hi people, i have just took my mates new car to rebuild it,that he brought of ebay, a ex Darren Potter car, but the funny thing i found was on the rear suspension, that was the normal rear spring, but also a smaller spring as well, its shorter then the front springs, what is this for and does it work?........

[ch!3f]

its stiffens the last few mm of travel forcing the opposite wheel to grip the track almost like an anti roll bar i think anyway