I think the chances of me lining both sections up in a way that doesn't leave one slightly higher than the other are either very low, if I were to do that. Which would drive me insane.
+1 to laser level. You are welcome to borrow mine, but it was only £20 from Lidl should you wish to expand your tool library. Seems accurate enough, and comes with a clamp to allow you to clamp it to pretty much anything.
I think the chances of me lining both sections up in a way that doesn't leave one slightly higher than the other are either very low, if I were to do that. Which would drive me insane.