Using an adjustable wrench or spanner, loosen and remove the headgear nut.
Tip: When turning the headgear nut make sure you don’t turn the whole tap body, as this may rupture or strain the water pipe under the sink. Get someone to hold the tap while you use the spanner to turn the nut. If it is still difficult, apply a little penetrating oil to the headgear nut and let it soak in for 15 minutes. You should also grease the threads of the headgear nut before you reassemble the tap.