Could a Syphon were the handle is possibly not fitting correctly to the hook cause strain and cause the seal between the syphon and the cistern to leak.
If it’s not leaking when flushed, the it seems to me the syphon backnut, silicone where the tail is, or something obstructing the seal. If it’s any of these, the. Swapping out for a flush valve might not achieve anything.
If the syphon is properly and firmly connected to the base of the cistern with an intact donut seal, I don't think even a badly fitted handle and hook will cause it to leak. Has this just started to happen or has it been an ongoing issue that you've just tolerated?
To fit a push button operated flush valve you'll need to remove the cistern from the toilet anyway, so that would be an oppotunity to fit a new donut rubber washer between cistern and toilet that should stop the leak.
I've only fitted a few but allways put s good smear of clear sealan around the syphon after inserting it in the cistern and before putting on the securing nut
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