Front Weights

[butters86]

I've heard a bit about fitting weights to the front of a rear motor 2wd buggy to improve handling

I've just taped a metal tube to the front of the shell / chassis (crude I know!) to test out the theory and found the front wheels stuck in much more under power and stopped the car flipping as much when cornering hard on grass. IT generally made it much more nimble and less erratic.

So what weights to people fit and where (guessing where the servo is?)
And what actual weight in grams should I be looking at?