Cross thread on shower mixer

[Unregistered]

I had a leak from the hot water input to my shower mixer, I tightened it but it got worse. When I stopped the water and removed the mixer I could see that the thread on the bit coming out of the wall was crossed, tape hasn't worked, any ideas what I could do without having to know tiles off the wall and go behind? I'm a very amateur DIYer

 

[Dotty]

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