, in my opinion a sweet word, is how we call this traditional marking gauge in my mother language. From Wikipedia, "A marking gauge is used in woodworking and metalworking to mark out lines for cutting or other operations.
". Wikipedia also tells you: "The purpose of these gauges is to scribe a line parallel to a reference edge or surface."
. You have probably already used a primitive version of this tool: when you pick a pen and draw a line parallel to an edge, by pressing your finger against the edge to maintain a constant distance of the pen's tip to the edge.
I always wanted to have one, of course :). But the ones I found were quite expensive, and that is what usually puts me to think (there's a saying which states something like "the need makes the inventor" ;)).
So I looked at my small material stock and this squared section 1.2x1.2cm (1/2 inch), 100cm (40 inches) long piece of wood draw my attention. I picked Inkscape
(excellent OSS 2D vectorial drawing application) and designed this marking gauge using only this wood stick, a nail and white glue (also known as "glue for wood").
Before starting with the construction, I did a paper model of the headstock, just to have a feeling if the measures I choose would adapt well to the hand. They did.