Nice idea Otto. One caution, on a highly finished item-like a knife bolster-be very careful you don't scribe the edge at the same time you scribe the surface you want to scribe. Many use nylon, plastic, pencil lead and even gold wire in the off side leg. Fred
This is WAY too simple... Carlos wants shiny stuff with moving parts!
By the way, Steve Lindsay came up with a fancy new brass adjustable "border scribe" right after that last gauge/scribe thread - only $70! (No, I don't have need of one, let Carlos get ahead a bit)
Should anyone be worried about the longer leg of the tool marking an adjacent side of the piece being scribed, I would think that a small piece of Scotch tape applied to it would solve that problem. I don't believe the tape has a thickness of more than .0015 to .002 thousandths.
Saw blade make nice engraving tools,back in the day I made engraving chisels from industrial hacksaw blades witch held up for a long time without much sharping. J.J.
I have several old flat gravers that were made from sawblades that the railroad used to cut rails with. One was made by Victor Vasquez.
Also have other tools made from sawblades, leaf springs and engine valves... and a full set of carbon steel kitchen knives, yet.
Yes, they will rust - and quickly, if not taken care of properly. But they are some of the easiest to sharpen and stay sharp longer than any others I have ever owned.