Adjustable Steady Rest

[undercut]

For all you young guys with a steady hand, don't bother reading this.
This is for all of us older not-so-steady welders.
I built this height adjustable steady rest so my welds don't look like I did them while I was attached to a concrete vibrator.

I really like this idea. By extension, maybe have something that can slide horizontally (but not too easily, of course) as an addition?