Mira Coda shower bar cartridge question

[juco]

Had issue with shower bar, however was cheaper to replace with new shower bar.
Now I have taken the Mira off I thought to inspect it hoping to find what the issue was.
I am at the stage as per image how do I get the cartridges out, I didnt want to force anything til I got some advice.
It looks like one I have to undo the nut the other I don't see anything I can loosen to get it off.

Advice anyone.

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[dewaltdisney]

If you do a Google search for 'exploded view Mira Coda' and then select images you will see a number of diagrams you can have a look through to find your valve. It will give you a better idea of the disassembly method.

DWD