Hi
The flyaway seems to be an issue for many, i think this is especially if have a bad exeprience with it early on.
This brings up the issues that once you have the fear, there is no good advice, unless you are 100% comitted to actually doing it or trying to do what you have been told by your coach or read on this board.
To safest think you can do on a flayway to make sure you never pull on the bar, is
1- At the bottom of your tap, make sure you are stretching down as far as you can, like you are trying to touch the floor, this will ensure you have no gaps between your ears and your shoulders. This is probably the greatest error you can do, because as you tap, your shoulder angle closes and you start coming towards the bar
2- Feel that as you tap! you are pushing the bar away through your shoulders (this doesn't mean let go, it means just keep that no gaps by your ears at all time). If you are pushing away you aren't pulling back, which mean that (especially with a tuck) there 99.9% chance that if you released at absolute vertical and you some how managed to have some rotation you will still ba far enough from the bar not to hit it (mayb a toe will touch at most).. Key thing again is stretch away from it
3- See your toes on the release and turn over fast (a strongggg tap to make the flyaway go up and away rather then away and down).
If you do these things there is almost no way you can hurt yourself, and soon you will see that this is probably the easier gymnastics skill ( the single at least).
However even though it is so easy..its a huge mental milestone, and you should be super happy when you get pass it.
Trust in yourself, and in your coach (who can shadow you). Dont rush, and don't do what you feel you want to do, do what you know you have to do.
Hope that helps and good luck.. believe it and then do it.