It is important to establish some sort of datum line that you can measure off of.
Keep in mind, sometimes things are made with dimensions that are not the same on both sides. This is done for no other reason but to frustrate the poor guy trying to repair them. :thumbsup:
Welcome to my world.
Yes that is exactly true you talk like a frame man!
I was a rebuilder/used car dealer for quite a few years and even went thru Chiefs frame school when I bought my frame machine then was educated the hard way here in my shop hahaha.