I make several of these beard combs in advance of any customized engraving. Once a customer orders one with cusotm engraving, I use a jog to make it go a lot easier.
Make your jig....
Now you have a jig to be used anytime you need to engrave into the same type of object again
Engrave another of the same object
Here is a link to a Youtube video showing the process more fully. https://youtu.be/KKXzw1ETAeY