Hi Kelly. Mine are thin bakelite with about 1/16 wide letter  groove but they do not go through. I turned a very small ball end stylus and have to hold it down when tracing or else it slides off the line and makes  scrap. That is why I cut an wider/deeper  tracing so I can follow it with a 1/8" ball stylus and it hardly ever misses( except if I have a couple beers before duplicating. This  is a poor analog person's HNC-(Human Numerical Control)  machine  !!!!!!!!!.What is size piece can you duplicate on the Radio Carver??............Cheers, Jim
Thanks Oldrivers, Eric and mike!!!!..Cheers, Jim

Cheers, Jim ........................ Variety is the spice of life...............Learn something new every day