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Berrymagicoal Shower - hot/cold control does not work ?

I have either a Berryflow 372 or Berryspray 373 Shower unit. Approx 20 years old, not sure which. The lower stabilizing valve knob does not control the temperature.
Any suggestions ?
M Collingwood, February 2011
link Click here to see other fixes for Berryflow 372 or 373.