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Pressure control impossible to turn

This question is regarding Mira Excel (1990-96) Cartridge - 903.33

Is there something preventing the setting of the pressure control that needs to be released before attempting to turn the control? It doesn't turn however hard I try.
What is the function of the black knob with an (apparent) screwdriver slot in the centre of the control? Is this something to do with the problem?

Asked 2 years ago by John Banks
These cartridges are sometimes hard to set , but a spray of WD 40 may help.

I have never needed to touch the black knob to adjust anything so would tend to leave it alone.
Answered 2 years ago by Barrie Seabright
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