I have been trying for a while to make my second leather sheath and I cant seem to get the hang of pricking the holes and stitching. I should start off by saying that all my leather working tools are from amazon and to my knowledge aren't the best but probably aren't the worst. My question is how do I create the holes with my pricking iron through 3 pieces of 4mm thick leather. I have tried pricking them in 1 layer at a time and matching the layers then gluing and stitching. I have tried pricking through the top layer and the welt at the same time then transferring these marks to the bottom layer. Any combination of these my pricking iron gets aggressively stuck in the leather even if I don't go the whole way through and bottom the stitching iron out. Nothing seems to work come stitching time. I need to use pliers to pull the needle out and an awl to enlarge the holes. The last sheath I attempted took me 4 hours to stitch... Someone please send help!