"This is a brass and copper hinge-mechanism I made so it'll consistently pierce through the jump-ring with a hollow tube so it can transfer a piece of jewelry. So pretty much, it's an automatic piercer. 

I thought about inventing this when I decided my hands were too shaky to be a piercer after practicing on a few friends.

I'm also fairly sure I had watched a bit of Willy Wonka and the Chocolate Factory before designing all the shiny brass..." 

Via: Matt Mauk