I recently had to replace the diaphram in the cistern in our toilet. Every since we've had a drip from our overflow pip. I've tried adjusting the float inside to cistern to both it's max and min settings and have fiddled with the diaphram until the cows come home but the drip still happens. It only stops when we turn the stop cock off but when we do a wash which needs the water being on for a long time the drips turns heavier. Any suggestions would be gratefully recieved.