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Apologies ,no offence intended.Ps, I am am appreciating people's help but would prefer not to be called mate (or love)
There is a large nut ,usually plastic, on the underside , that's what the flush valve screws into . To assemble properly ,the flush valve goes in position ,with washer below it ,and the nut is tightened from below. The way you are doing it ,you are rotating the valve and in doing so ,tightening against the seal with a " twisting" force being applied to the seal. It's entirely possible that this is not making a watertight seal ,and is the cause of the water loss