I have just fitted a new sink in my cloakroom which has one of these click/clack waste fittings, with the overflow running into the slotted waste fitting The plug fitting drops through the hole in the sink, with a plastic washer between the plug and sink, with another plastic washer/seal that fits under the sink with a large nut to tighten the plug to sink joint. My problem is I cannot tighten the nut enough to prevent water running down the thread of the waste fitting below the sink. I'm guessing that the water is finding a route either between the plug and sink on the top side, or possibly through the lower washer ? Is there a better way of sealing this ?
Thanks Tony