Its OK, I opened it in Backplot and took a look at it ( not mastercam backplot a separate program ) , The spring loaded tool may work for some stuff but the derby covers that I had to do needed way deeper paths then what that engraver tool can do , as I said I use a drill mill that is sharpened center cutting.
If those covers were purchased you will need to have a good spring scribe to do the work. Most of them are not consistent. The dome varies as much as .050" in height. I just make my own covers that way I know where the surface of the dome really is.