Now we go back to the drill press and carefully drill our stitching holes. Try not to rock the sheath from side to side if possible. Three layers of this heavy leather can run from 3/8” to 1/2” in thickness, so if the drill bit wanders much it will show up on the back side of the sheath as a very wavy line of stitching .
Another simple suggestion is this: if you’re using a drill press, set the quill depth stop so that your bit just barely penetrates into the scrap wood under the sheath. You can then just drill until you hit the stop and always know that you went clear through the leather, without constantly checking, and without going way deeper than necessary.