[Aussie Mike]

Remeber your upper and lower arms are right and left handed. If you get them round the wrong way you will end up witn no castor or even negative castor.

When I first got mine together I had the top arms round the wrong way and I had about 8 degrees positive castor. Great for a drag car but hard on the arms when you want to turn corners.

Ideally you want about 4 degrees of positive castor. When you look at the upright from the side the top pivot should be behind the bottom pivot so the upright leans back.

Cheers