Thanks for the help . I still cannot make it because it was tightly attached to the wall with very little gap . I decided not to risk it and called the landlord to send some authorised people to fix it .
Can anyone provide me any help to open this cistern ? Apparently I found no lid on this cistern . I want to open it and check why it has no water today but I subsequently found it comes in a single piece with no lid . I can however unscrew the flush button successfully but the cistern is still...