My mira 114 shower which I have had for 20 years has been leaking fom the control dial for a while now. It is surface mounted and the leak is coming from the bottom of the control dial and runs down the flexible shower hose, I originally thought it was the hose because of this. Is this fixable? I know its 20 years old but its been a great shower and I'm not sure if I would get one as powerful as this one so I'm hoping I can get it mended?