Why a D-loop under the nock set? Less nock pinch. I’ve experienced D-loops pinching the arrow nock enough to lift the arrow off the rest at full draw. After switching to a tied on nock set with a D-loop below and my levitating arrows went away. This setup does provide a little more downward pressure on the rest as well. One last thing this setup does for me is to allow me to easily fine tune my setup. If I need to raise or lower my nock set, I simply screw the nock set up or down the string with the server acting as threads.
Place the bow square in line with the center of the berger button hole.
Using server material, tie the first knot 1/8” above the center of the berger button hole.
Continue with alternating the knots on opposite sides of the string until you have 3-4 wraps of serving (about 6 knots total). Then work your way back down the string overlapping the serving you just tied on.
Complete the tying by tying a second knot over the first. Melt the ends and you’re done.
If you’re having problems keeping the knots tight while you’re installing your nock set, place a little bow string wax on the serving. This will help the serving be a little more sticky and help hold the knots while you’re tying the next knot.