This project was made in april-2015.
The idea is borrowed from a naval modelism forum. The moment I saw it, I thought it was interesting and handy, so I saved the pictures, but I forgot to save the link.
It is made with a leftover piece of oak wood, 3/4”. The pins are 5/32” steel rods, and the stabilizers of the sliding jaw are reused 1/8” steel rods. Screws are 1/4” and 5/16”. The unique finish touch is boiled linseed oil.
Besides modelism, it could be useful to hold small wood pieces for carving, pyrography, drilling, gluing, painting, etc.