[stephen low]

David

Any type of pic would be good for me so yes please.

Re-reading your post, please correct me if I have pictured the wrong items!

The pinion flange I presume is the face to which the tailshaft is bolted to? If so then the string line would be run parallel to the chassis rails, assuming the chassis is square in construction, or averaging the distance to the rails each side if not.

The hub flanges are the faces against which the wheel rims bolt? But here with pivoting arms, the pivot bushings have the potential to cause excess lateral movement if worn?

Cheers