Removing dual action push button toilet cistern lid

[PeteLuceExeter]

I watched seven videos and read numerous instructions and none tell me what I need to know. Have removed both metal push buttons to reveal a central retaining screw between the two plungers which the buttons operate. All the instructions say to unscrew this screw to allow the lid to be removed. However, this central screw (white plastic) does not have any groove in which a screwdriver can engage. The groove isn't worn away, there is just no groove to start with. It's just smooth plastic. I've no idea what make it is as bought it twelve years ago from B&Q but they do several makes which all look the same to me.

 

[CBW]

Photo would help massively here

 

[PeteLuceExeter]

here's a picture. The white button is in he rectangular hole between the two white plungers.

 

[just pumps]

The "white screw" isnt a screw so dont touch it! Im fairly certain the whole thing simply unscrews but havent touched one for sometime.

 

[JohnD]

stand back and take a wider pic showing the whole lid

 

[PeteLuceExeter]

 

[CBW]

Looks like the whole button assembly unscrews as per @just pumps

 

[JohnD]

have you tried unscrewing the chrome collar?

i have that, it is a Geberit.

yours looks like it might be the same (can't see the tops of the buttons)

you may need rubber gloves to get a grip

 

[PeteLuceExeter]

Yes I've tried unscrewing the whole chrome collar, it doesn't budge, the whole assembly moves with the collar. The white button in the middle is actually a moving part I've realised, it moves down when I depress either of the plungers, like it is linked to them. Other types of dual-action flush have a screw in that location which is what confused me. But anyway, my question remains- how to get the lid off? Some part of the push-button mechanism is obviously holding it down, but I can't see what else to remove to free it. It's not a Gerberit, I've seen videos of them, they do indeed have a screw which is what confused me.

 

[just pumps]

If you have tried lifting the lid and it only moves up 1 or 2mm then that does unscrew.
Forget all about a screw, you dont have one.

 

[RandomGrinch]

I have a similar mechanism on my Roca.
As the others have said, the whole chrome assembly unscrews.
I have found the best way to unscrew it is to put my thumb into the hole and grab the collar with my fingers.
Jiggling the lid around a little at the same time also helps!
Good luck!

 

[PeteLuceExeter]

Thanks but it's definitely not a Roca, there's videos of those, they do have a screw. The assembly does not unscrew even with a wrench. There's about a millimetre of give in it either way but no more. I'm afraid to force it any further for fear of breaking it.

 

[just pumps]

Thanks but it's definitely not a Roca, there's videos of those, they do have a screw. The assembly does not unscrew even with a wrench. There's about a millimetre of give in it either way but no more. I'm afraid to force it any further for fear of breaking it.

It is off yet.