I reckon you should hold fire until after the competition before you post any proper feedback.
Even though you won't be including your scores it will still be pretty indicative of how you've scored the various riders (I'm sure it'll be clear who is your 'winner' for example).
Just a thought
It's cool that you took the effort to do a little summary of each video though, I'm sure the riders will be happy to hear your constructive criticisms/praise
Not really anything magical about it, it has a screw thread stopping the wheel from moving forward, the only way it can possibly move is by turning the bolt or stripping the threads/shearing the head off.