Cut out your patern- do eny carving, stamping ect, and you do wet the leather from the back side.let leather dry,do your dyeing,staining etc. Cover knife in plastic wrap,i use bread sack. dampen leather from the back side insert knife and clamp edges, press leather around the knife too form fit. let dry. remove knife and insert gusset leather between the edges, make sure it is slightly larger than needed. glue pieces together and clamp. after drying use a stich spacer to mark the line you wish to place your stiching, looks like a spur rowl. or use a ruler and a pointed object. Drill them or use a hand awl to punch the holes,stich them together, cut all three pieces at once the distance you want from the lacing. clean them up with a fine sand paper, blacken the edge with edge coat if desired or put a little wax on them and polish with cloth, iuse a piece of waxed canvas cloth. For a finish i use Pure olive oil 2-3 coats, be sure to use a dober to get it down inside the sheath.
All done.
This is one i've been working on.