I use the ajustable groover around the edges, and a freehand groover around the line of the pistol. Only groove the front side around the pistol line. Then I run over the stitch line with a stitch wheel. This is a great little tool that quickly lays out each stitch hole perfectly. Next, take a diamond shaped awl and punch a hole in every mark you laid out. Once that is done, flip the holster over, and you'll ave a dotted line where you need to use your freehand groover. I then wallow out the holse a bit more from the back side with my awl, and It's ready for stitching. I use a needle on each end of my thread to make what is called double stitching. Hope this helps.