Review on Co-link Adjustable 1mm Leather Edge Stitching Groover with 🔪 Wooden Handle - Premium Leathercraft Tool for Precise Grooving and Gouging by Rebecca Waffles

4 star rating because I've had mixed results with it. Sometimes a thin strip of leather is removed and passed straight through a 1mm diameter hole and the finished product is amazing. In other cases the skin may not actually be cut but "grooved" as the strip is not visibly removed, which I attribute to "plugging" a 1mm hole and I can't figure out how to fix this. Even poking out a piece of skin with a needle doesn't work.