So the valve knob thingy is sticking on my shower, removed it and tried soaking in descaler and also various vinegar solutions without much success . Having not long recovered from abdominal surgery pulling the little bugger out I am actually risking a hernia. The above fix works for now but the gf is not so impressed with the aesthetic look.
New valve with a tap was tried as well but the flow was pathetic so put this one back on, looking for any suggestions for a better fix?