Help. The instructions are missing. How do I reduce the height shaft to fit in the toilet. This is a very urgent problem.
It looks like it needs to be cut.
Sorry to see that you are having an issue with your cistern. Hopefully one of our members with plumbing experience like @LePallet can assist. Or perhaps you could phone your local store if it is too far away to drive?
Let me also extend a very warm welcome to the Workshop community. Feel free to post whenever you need a hand with your projects.