All of a sudden and quite out of the blue the toilet cistern has decided to make scary noises on the refill cycle

. No, it's not water hammering, it's a loud, vibrating hum (low register) that stops as soon as the water level is back up.
I've taken all the bits off the shelf, removed the top, fiddled, proggled and poked around but to no avail ...

I'm büggered if I'm going to get a plumber out at ¶˙^ø•†©ø per hour or part thereof just yet! It's only water moving from one place to another ~ not quantum physics

There must be a way to fix it ...
