Because I wrapped the handle I have to modify the sheath as the retention of the knife is caused by a clasp that goes over the handle. I've made a lanyard knot (also called Chinese button knot) that I will sew on the sheath and will then sew a loop onto the other side of the sheath so I can loop and button the sheath closed for retention. I'll post a pick when done.
When you're done wrapping take the end and place it through the loop.
Finally pull on the other end until the loop is about four turns in (obviously I didn't have enough cord to make that many turns, but on a knife handle you would). Cut and flame any excess cordage ends.