I have too much time on my hands.
I could have probably bought a gold plated commercial version with the time I invested in it.
It's not an original design, but I thought it would be neat to post. It uses a screw driven carriage to advance the board at one turn=1/16" using 3/8"x16 threaded rod.
The only unique feature is the decal that shows the location of the board should I mess up counting the turns.
-Jeff