How to align ball screw to linear rail?

[Sterob]

It's exactly same as the rails. Why do you need a flat surface.?

So I can get accurate results. That method is like balancing a ball on top of another ball....

Just indicate off the side of ball nut or screw.

Watch this.

I watched the video, thanks. It shows the person indicating somewhere around the top of the ball screw and then carefully pivoting the mag base and metal plat up so he can move the Indicator up the other end of the ball screw.............I can't imagine that being good engineering practice.

But if thats the way its done, I guess I don't have other choice.
I just thought there might be a better way.