[Steve]

Cheap, painless, and very functional. I found the screws in my junk bucket (two different ones no less), but steal your friends cheapo sunglasses and those should work. I had to use an exacto a little to widen the hole first, then I just screwed them in. Tightening one side has a stiffening effect on the other. Generally, stiffer suspension causes the car to turn faster. I found that by setting them at different levels, you can make gradual turns one way, but really sharp turns the other....works great on tracks that have a sharp hairpin thrown in, or wide sweeping turns, or both.