I start out with a 4 3/4 in piece of loop material. I have found that Allen makes a great string loop material, it burns good, does not stretch and holds it's shape very well.
After I cut my loop to length I burn both ends into a nice big melted ball. I like to do this off of the bow as it gives me more control of the melt. If the flame is too close it will burn the end leaving a burnt charred like appearance. This is not good as it will make the end weak and could break. The end should melt but never catch fire.
Next I locate my nock position and tie in my first nock set. I tie the nock just like you would any knot but instead of a complete knot I only tie half, then wrap the serving material around the bow string and tie again. I repeat this till I have done it 5 times (you can do more of less) the last knot is a full square not to keep it in place. I cut the ends and ment into place.
I then slip on an arrow nock to give me my proper spacing and tie the second nock set. Once that is done I am ready to tie on the loop. This is a little difficult especially if you have big hands like me, but if I can do it anybody can.
I tie the first knot on the outside of my tied on nock and pull it as tight as I can. I do this by wrapping the loop material around a screwdriver and pull (like a "T" Handle), I then lay theuntied end down on the string over my second tied on nock. I tie the second knot. This one will be difficult because there is not alot of material to work with, you will end up pushing the melted ball through the knot. Take your time and don't get frustrated.
After it's tied you will have no loop to speak of but after you pull it some it will take shape. I use a pair of needle nose pliers to spread the loop and get it tight. After that I knock an arrow, attach my release and pull. I don't pull it all the way into the let off because I want as much weight to cinch the knot. Make sure you are pointing your bow in a safe direction.
It's important to make sure you tie your string loop in opposite directions so the melted balls are on opposite sides of the string.
When done it will look like this:
As you can see there is just enough room to put my release on once an arrow is nocked.
Good luck and remember it will take time to get that second knot tied on but this way you will be assured a nice small loop.