A scratch stock is simply a block of wood designed to hold a small piece of specially cut metal. The metal has a certain shape on it and when you scrape it against some wood, it carves that shape into the wood. Good for making various mouldings or beads on the edges of pieces.
I’d seen this particular scratch stock on the Lumberjocks forum. The user who made it referenced an old Shop Notes magazine article. I dug up the plans and made my own.
In this one, there is a sliding bar that allows you to position the cutter wherever you need to. The bar is cut down the center and the cutter fits into that slot and is held in place with some screws.
The handle has a flat edge and a rounded side so it can be used against a flat piece of wood or a curve.
I bought a set of blank cutters, though any pieces of steel could be used. Using a file, I cut a multiple bead shape in one. And here it is in action on a scrap of pine. This could use some smoothing out with some sandpaper, but overall it works pretty well.
I haven’t found a use for this one just yet, but it was fun to build nevertheless.