I got this one used for 3-1/4 bennys. You print the stencils on a dot matrix printer, the ones that print on multi forms. 9 or 24 pins. There is a utube vid from Midway USA showing that dude Potterfield etching a barrel using the same setup. I just used the stencils that came with the rig from the previous owner and tried it on a barrel I fucked up many years ago.