Nosepieces and shackles

[Tony Press]

Thanks Russell - the Companion shows two figures- 9 degrees (too much) and 5 degrees caster. 

I would think that anything more than 1 degree will improve directional stability but too much makes the steering heavier.

With the early axle the radius arms can be easily twisted to set - later two bolt fixing arms are more tricky. 

All angles are dependent on loaded angle of the chassis- high at the rear reduces the angle.