Originally Posted by skyball

...hmmm, basically the outer ball eyelet of the "castor link" (tm pending) will move on the surface of a sphere, with the inner ball eyelet (chassis side) being the center of the sphere and the length of the "castor link" determining the radius. So using the short hole on the knuckle creates a shorter "castor link", thus a smaller radius of the sphere. A smaller sphere has a more curved surface, therefore you get more castor change when the suspension gets compressed = more reactive castor.

So much for geometry. How much reactive castor you want still remains to be determined at the moment.

Christian