After fixing this issue I tested drone and it is working fine as nothing happened to it. I can move camera up and down via Hubsan App and controller, video quality is also fine (therefore assuming no damage to image cable).
From my experience of doing it, it was not hard as I was thinking before opening drone and was able to put everything together. I hope this video helps others stuck in similar situation.
Here are links to QC GUY’s videos which were incredibly helpful. Most of all this information I got from him and his videos :
QC GUY's video: ruclips.net/video/EzXUTqqjXk8/видео.html&ab_channel=QCGUY&fbclid=IwAR1B33ERlsf5ZjNkvVe0vra9UEYlLquLG5e7ZqjmaTLTvuxaoUWNvlaWKWQ
QC GUY's video: rucli...