I'm having a problem trying to adjust the water flow in this old high level cistern. Thought it might have a slide valve (with washer inside), either or both of whch might need replacing, but turns out the part that functions as the valve is solid brass with a loop at the end (through which the float arm fits). Once this is removed, there's an 1/8 inch recess, with a thick rubber washer (quarter inch diameter) inside, which doesn't look damaged or in need of replacement. So far I've replaced the brass split pin that holds the float arm onto the valve body, but the water still gushes in, only tailing off a bit when the ball rises. Apart from shutting off the water almost completely, the only way I can get it to stop pouring out of the overflow, is to physically lift the ball arm (exerting more pressure than the rising water level will). There's a lot of give in the arm, which also moves easily from side to side, even after the insertion of the new split pin.
Does anyone have an idea of something else to try? Or is it time to give in; in which case, would it be cheaper to have a modern high level cistern installed, or get the existing one refurbed (assuming there is someone who does that)?! I've a bit of a soft spot for the old fangled things (my dad was in the Trade) so would really like to have it refurbed - would miss the old clang and clank it makes!
Thanks in advance for any advice you can give. And thanks for such an informative site as well.