How can I remove a shower mixer knob?

immusic

I have a dripping shower and I checked that the shower head and hose are OK, so I think that probably the cartridge needs to be replaced, but I can't figure out how to remove the old one.

When I remove the small front plate, it just reveals the temperature control screw, and turning it doesn’t loosen or remove the entire knob.

Can anyone advise?

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Sleeper12

There is a cap needs to be removed. It's on the tip of the control knob. A tiny flat head screwdriver or blade will do the job. Once removed you should see a screw. Removing this should allow you to remove the rest of the cap.

immusic

Hi Sleeper12,

I have removed that but, as described, it just reveals the temperature control screw. Turning it doesn’t loosen or remove the entire cap.

Sleeper12

Does it say temperature control screw or are you just assuming that is what it does.

Can you post another photo looking straight at the control

immusic

That's what it does. I have used it before when the temperature needed adjustment. It just turns to a certain degree left or right.

I'm not at home at present to photograph it.

Sleeper12

Most cartridges look like the one above. The screw that goes into the cartridge usually goes through the cap & into the top of the cartridge. Can you can post a photo of the screw later when you have time

immusic

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This is how it looks with the cap off. It can be moved only a small amount in either direction

Sleeper12

I see the groove is for a flat head screwdriver. Is there any chance a Philips head would find another screw in the hole in the middle?

immusic

The screw in the hole (I couldn't get the camera to pick it up) is flat head and just moves the outer visible part. I don't want to force it too hard in case I wreck it altogether!

Sleeper12

The 2 red lines look like a groove for a flat head. Is there another screw inside the red circle?

immusic

Yes, that's where the second flat head is. It's all one unit though. I mean it's connected to what you can see at the front (where you put the two red lines) as opposed to being a loose separate screw at the back. The inner screw moves those two outer grooves when it's turned.

Sleeper12

I'm not familiar with that shower. I hear you when saying big groove moves when turning screw in red hole. I'm wondering if you got a big flat head, one that fits the groove, would it do anything different if you turned it here instead of inside the hole.

immusic

I don't know where I'll get a flat head that big 😄 but I'll give it a go. Thanks for your replies

immusic

I made some progress! I managed to remove that temperature control knob and the on/off knob by using a bigger flat head as suggested, but the remainder of the knob won't budge...

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