Hello all. My wall mounted bath tap is leaking at a joint beneath the large chrome nut on the left side. The dripping has gotten worse over the last month or so. I think what happened is the large circular disc came unscrewed from the wall and my Dad leant on the spout by mistake which pushed the tap down a bit. I’m a competent DIYer but have no idea how to fix this. I know I can do it. I just need some guidance.