Interesting Tool

Gowa

Saker Profile Gauge with Lock

Kornbread

Could have used that building the house.  Trim work in particular. 

BrannigansLaw

This is actually quite cool for those with access to a 3d printer, CNC, laser cutter. You often find yourself needing to match a curve profile of an existing object as a vector, this gets you a profile that you can trace on a piece of paper, scan, and convert the bitmap to vector. I may just pick one up...

Billet

I have a similar device that I used for auto body repair many years ago.  I may have to dig it up it and use it to duplicate my hand filed tweeter flare on my 20/20 project.  It would be a nice tool for that.