Has anyone got or used one of these?
Claw Making Jig, For Making Wire Collets - Cooksongold.com

One of my students was given one for Christmas and despite us playing with it in class (and it's an advanced class, not beginners) we can't work it out properly! It didn't come with any instructions, not even a couple of diagrams, and a search of the internet hasn't helped much.

We've also emailed Cooksons a couple of weeks ago for help with it, but haven't had a reply yet!

Can anyone help? Pretty please?