I know this is a old post but I've got exactly the same problem on my mk1 rs focus. When my steering is straight driving along, there's a tight spot and a click/knock when I slightly try to turn right. Its fine left. Almost as though it won't turn but a little bit more force and it will click and turn as normal

This also disappears once I've been driving for 5 minutes or so. Only there when I first drive the car

Anyone get to the bottom of this?