How to renew a plastic ballcock in a WC cistern. Overflow running?

A bottom entry WC cistern and the easiest way to renew the valve without the hassle. Al shows you how to stop that overflow working.
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[@1954BJohn]

Thanks for the clear instructions Al - replacing mine this weekend -

[@BorinGTv]

Thanks for the help! Really helped my parents!

[@dereton33]

Top10 Things No problem. Al.

[@bashirbutt1456]

Good

[@dereton33]

Thanks