I have had to retile my shower wall and now with the double tiled wall, the mixer shower value won't now fit back on. I'm changing the mixer shower for the same one but the wall plates are thick so, there are no thread for the shower to screw on to. I think a flat wall plate would solve this but I can't locate them anywhere. So, I'm guessing there must be some kind of value extension I can get. The value in the pic that I have screwed to the wall plate, is from the new mixer and what is connected to the wall.