click-clack waste

My house is completely fitted with click-clack wastes and they've started to fail in various ways. In theory you can unscrew the piston section for maintenance but mine are solidly stuck to the waste itself and when I try to turn them, the whole waste starts to rotate as well. I can't use too...

Hi, the click-clack waste in the basin waste in our bathroom has started leaking. The problem is due to corrosion of the plating on the metal on both the fixed and moving parts. This appears to be due to these parts touching when the waste is closed. Can anyone recommend a replacement that seals...