Originally Posted by
fietsbob
Steerer tube in a V block on a FLat surface , then getting the fork crown square to that is the basis to work from.
if the fork crown is parallel to a known flat surface then the axle should also be parallel to that surface.
Agreed and the essential basis of my frame/fork building aligning system. But I doubt the OP has this equipment. Hence my simple tooling suggestion. Andy.