Take some Saran Wrap and put the end of the nock that goes in the arrow in it, then push it into the arrow shaft as normal. Right before it sits flush with the shaft, take a razor blade and cut around the Saran Wrap so you have a nice clean line. Then push it the rest of the way in. Nice, clean install, with nothing showing, and you can turn them to adjust as normal. If you need to pull them out, you just re-use the saran wrap, or do it over again. I've done it tons of times, as I really like the Easton 3D Super Nocks better than any other I've used.
All the best,
Glenn