hi mate, i would advise you to just close the sunroof and put it back together, as i thought my problem was the cog but the railing was also dodgey so i decided to play it safe and not pay a hefty bill for a replacement cog and later find it wasnt the issue, its up to you, whether your happy with the sunroof being closed permenently but i never used to open it, just the once when i was videoing cars lol