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Hang on guys, you've got it upside down.
The key measure is the angle between the top strut mount, the balljoint pivot and the lower arm inner mount. This angle needs to remain less than 90 degrees.
If you modify the lower arm, you are just changing the shape of the arm and the balljoint pivot remains in the same place verses the other two key suspension points.
The modification required is to space the balljoint down, away from the hub.
So those lovely arms are just fine as the are. You either need a different balljoint with a much longer stub so that a spacer can be put on first or a machined extension that mounts on the end of the balljoint stub. Substituting a ballpoint with a threaded stub might make it easier to make an extension piece.
If you look again at the right hand diagram above, you should see what I mean.
Cheers!
Last edited by Bruce.; October 20th 2011 at 15:55.
Reason: Removing errors about threads on the ballpoint .... Doh
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