Lathe Centre Height Finder

I got fed up with fiddling with tool heights on the mini lathe, so I cobbled together this

It's not hugely pretty, but it works and is adjustable. I like the base, as it's a bit of metal I picked up while walking somewhere, on the off chance I could use it, and I have, excellent. The brass and base are polished, but you can't see that in this picture very well, so there's some shiny bits.