How to remove top of tap?

[Lenster]

Tried removing stem to access the grub screw? But only succeeded in damaging chrome.
Thanks for any help. It's leaking and I need to change the cartridge.

 

[snowhead]

Usually on that style the top is a thin cap screwed onto the body of the handle.
Hard to see from the angle of the phot if it is on this one.

 

[Lenster]

Looks like it's one piece to me.
Assume thete has to be access to a grub screw somewhere?

 

[Gasmk1]

Try unscrewing the the long handle could be there

 

[Lenster]

Tried increasing the long handle but all I did was remove some of the chrome.
Is there a way to loosen that stem?
Probably limescaled solid

 

[ShaunCorbs]

New tap

 

[Lenster]

New tap

Managed to remove the stem after descaling and wrecking it with grips
but I can get a replacement.
Removed the grub screw but the cap wont budge now. Is it limescale again?
Any safe way to remove as I really don't want to wreck this part if possible?