Mike,
A friend of mine milled all he could of the side of his ball joint about an 1/8th" (3mm) to cain caster, but it was not enough to make any difference.
On my car I extensively reworked the top arm to move the ball joint back 3/4" (19mm) This made a big difference. My car used to dart around at high speed and had very little self centring. Now it feels stable at high speed, and has good self centring. While I was at it, I welded a piece of metal behind the ball joint, then drilled and tapped it to except an 8mm bolt with lock nut. If you look closely at the picture, you can just see it touching the back of the ball joint. This locks the camber.
I have never had a caster gauge on the car, so I can't tell you exactly how much I have gained, but certainly drives a lot better.
If you look at my website, there are pictures of the A arm before and after. http://www.woodsautomotive.co.uk/myrestortaion.htm
In case anyone is wondering, yes my brake pipe was rubbing the wheel! But only on full lock. I have since fixed it.
Johnny
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