I have one arrow that I had been using for bare shaft tuning that seems a little loose when even a new X-nock (from another arrow) is installed. I can't find any cracks, but it is still a little loose, so I stopped shooting it as a precaution. My biggest problem has been a source of X-nocks to replace the ones (5 now) that have been ruined.
I did get to shoot a reasonable amount on Saturday morning. My bow wasn't tuned nearly as well as I thought it was from shooting 16 yards in my basement, but eventually, I got bare shafts arrows to fly pretty good out to 40 yards. I had some problems early, and had to make some adjustments, but ended up shooting two four-shot groups at 40 (two bare, two fletched) that were around 2 1/2". I need to do some more work with the bow (and myself), but I don't think the arrows were any part of the problem.
Anybody know where they sell a dozen replacement X nocks?