My bathroom sink hot water tap will turn on fully, but is very stiff. What can I do to repair it?

Clive Goodwin, January 2005

In some cases it's a build up of lime. I've also been told that some of the cheaper taps react to the hot water and the shaft expands but is unusual.
Remove the tap head and try WD40 on the shaft. It cured mine albeit for a couple of months. Another way but it requires tap dismantling is to apply vasalene to the shaft of the tap.

bob, January 2005