When you have a wood vise such as this one:
I must give credit to Rick Sparber for the tool I’m presenting here. He published the idea of it on the [homemadetools.net](http://www.homemadetools.net/forum/self-centering- scribe-8482) forum.
The purfling cutter or scriber is a tool that allows scoring or cutting the thin groove that will fit the purfling on a top or back of a violin, as well as on the edge of top, back and sides of string instruments like the guitar or the mandolin. The tool allows scribing this groove parallel to the edge of the top or back.