then you need to file down the plastics slightly.
- can you explain pls
Ok, so if the reason the ball is catching is due to the bridge not fully closing because the plastic on one side is catching the plastic on the other, you need to take a file or some sort - to be honest a nail file would prob work - and file away at the corners of the plastics which are catching. Ie you want to shave off a little bit of the plastic on each side to stop one catching on the other. Prob want to put a towel of some sort underneath while you do this to catch the shavings.
If you take the glass off and manually move the bridge up and down you should be able to tell if it’s the plastic catching or another issue affecting the movement.