Adjustable Groover

An adjustable groover cuts a narrow, shallow channel into the surface of leather, usually running parallel to an edge, so that a line of stitching can sit recessed below the surface rather than proud on top of it. Recessed stitching wears better over time, since the thread isn't the first thing to make contact with a surface it rubs against — the leather itself takes the abrasion instead.

The tool consists of a small blade set behind an adjustable guide arm, which rides along the edge of the leather to keep the groove a consistent distance in. Some grooves are meant to be sewn flat inside; others are meant to close back up over the stitching once it's done, hiding it almost entirely.

How to use it

1. Set the guide arm to your desired distance from the edge — commonly 1/8" to 3/16" for most stitched projects.
2. Hold the tool at roughly a 30–45 degree angle, with the guide arm riding flush against the edge.
3. Draw the groover toward you in a single smooth pull rather than stopping partway, which can leave an uneven depth where the stroke restarts.
4. Aim for a shallow channel — deep enough to seat the thread comfortably, but not so deep that it cuts into the leather's structural strength.
5. Follow the groove with a pricking iron, chisel, or awl to place the actual stitch holes.

Care

Keep the blade sharp — a dull groover tears leather fibers rather than shaving a clean channel, and it also makes the tool harder to guide accurately. Most groovers take a small replaceable or sharpenable blade; strop or hone it the same way you would a knife edge.