Hi guys, sorry have to ask a total noob question but I'm not sure if I can adjust this ballcock in my main tank (picture attached)? It looks like a toilet ball valve rather than for the main tank. The white plastic rod is completely rigid and won't bend, and I presume the washer is wearing out as the water level is reaching the overflow pipe causing a drip early in the morning around 7.00am. You can see in the picture the water is near to the overflow even in the evening. Is it easier to just replace the whole thing for an adjustable one, or can this one be tweaked to make the ball sit lower in the water and therefore push the valve in sooner? I've pushed the ball and plastic rod up to highest position and it does close off the water completely, so maybe the washer is ok? I just need the position of the ball to be lower to enable it to close the valve fully before it reaches the overflow. I think the wrong valve was fitted here as it's letting the water get too high even when it was working ok. Thanks for any ideas!