The clamp comes in handy again to hold the string while you prep for the knot. This is the point at which I melt the ends of the cord. Because at this point determining the final length is more practical. You can use a lighter to do this. I used a soldering gun because it was on the table already. You can quickly form a point with the molten nylon by rolling it on a solid cool surface like a piece of steel. I use my fingers because i'm hardcore like that haha and well it's easier. I have never blistered from this, but be careful it could potentially hurt.
I used a reef knot / square knot to secure the wrap onto the handle.
I then take a rather blunt homemade needle and jab it into the end of the cord to poke it through the hole in the handle. The melted end keeps the needle from punching through the cord. I have found by sending the ends of the knot through a hole like this further secures the knot. Also in this case keeps the wrap from wanting to slide down and off the end of the handle.