The D-loop allows the archer to hook a mechanical release onto the bowstring to avoid wear and tear on the bowstring and to ensure consistent interaction between the bowstring and the release. It is an integral piece of the bow system not only in terms of consistency and accuracy, but also safety and longevity of your setup.
You can watch the video below as Conner walks us through the in-depth D-loop tying process on his bow. He also goes over the tools you will need and how to know where to put the loop on your bowstring. If you want to follow a simple, graphic-based instruction guide, scroll down below the video and I'll walk you through it.
Step-By-Step D-Loop Tying:
To start off, you'll need about 5" of D-loop material. Use a knife or razor blade to fray one end of the loop section and then use a lighter to melt that end until it shrinks down into a solid ball of melted material - this will be your starting point.
At this point, locate the section of bowstring you will be attaching your D-loop to and wrap the section as shown in step 1 below. For step 2, pull the material tight so that your melted piece won't pull through the knot you have created around it.
For steps 3 and 4, you will again follow the image below and tag the long end of your material section and begin to tie the other half of the D-loop knot. Remember, this knot will be opposite of the original knot, so make sure to start on the opposite side of the string.
I steps 5 and 6 below, finish off the second loop knot and pull it tight. Each knot should be facing away from the other - this is a safety measure to ensure a tight knot and equal pulling.
As a final step, cut and fray the loose end of your loop knot and then proceed to melt the same small ball of material that you did at the beginning - be careful not to cut, melt, or burn your bowstring or the rest of your loop knot. Once that is done, use the applicable pliers and tighten the loop knots onto your string while stretching the loop to its working length/position.
Congrats! You're done and that's all there is to it!