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The black pin in the centreI don’t think you need access to the rear unless you going to replace the whole unit, to replace the cartridge that would all be done from the front.
But if removing the whole assembly the the red and blue spigots will be held in place with a small pin, that needs pushing out.
If the nut is nylon , I’ve had a problem undoing the nut because a box spanner just slips.Tried to get the nut of the front once handle was removed to get at the cartridge just will not budge so that’s why I am taking the tap off and I will replace the whole tap with a easier one to maintain
Good idea I am in Spain so I am going to cap the shower pipes off and give it a go when I get homeIf the nut is nylon , I’ve had a problem undoing the nut because a box spanner just slips.
My method is to drill a couple of holes in the nut flange and use circlip pliers or long nose pliers to undo the nut (red) and holes (green)
View attachment 1044325
I found this when doing the leaking kitchen tap. Sprayed the flimsy chrome collar which needs removing to get access to the nut and the nut itself with a release agent and left it while I had a cuppa. Thereafter, the collar came off and removing the nut with a shifting spanner was easy.Tried to get the nut of the front once handle was removed to get at the cartridge just will not budge so that’s why I am taking the tap off and I will replace the whole tap with a easier one to maintain
Did you have a problem removing the black plastic nutHad the same problem removed the cartridge soaked it in wine vinegar this removes any salts replaced job done works fine