And that's a NO, from me. I've had chiropractic treatment for years, and normal physioterrorists too, that looks dangerous.

The best neck reset I ever had was from a football (soccer) physio, she did a slow drop/fall backwards manoeuvre whilst supporting the head against her chest with hands under the chin and thumbs behind the ears, with her arms under mine, man that felt good afterwards. She taught me how to do it to her too, as she had neck issues that needed the same technique and I've used it on my wife a couple of time when she's needed it, not something to try if you don't understand the dangers and dynamics involved...