mixer tap washer replacement

[etaf]

I want to change the washer in a kitchen mixer tap (I have changed before abput 10years ago ) but this time i seem to be at a loss as to how to get to the barrell

The taps are clear plastic type

I take the screw out from the top and take the cover off

but then i'm left with a plastic sleeve which still turns the tap on/off - i cant see how to get that portion of the plastic off

it has the screw spindle in the top - which the main tap screws into - then around that is a nut shape - which aligns inside the main tap cover i have removed

i just cant see how to take that sleeve part off ........
i feel it should maybe just pull off - but do not want to break it

a picture of the mixer tap is shown here

.CAPRI CP RANGE, DUAL FLOW SINK MIXER 7" SPOUT

TAPSHOP - discount taps store - CAPRI CP/CPsink taps & mixers

 

[ProffesorPlumb]

If its a plastic hexagal shape component, then this shoud come straight off the brass spindle.

It may need a little levering with a screwdriver or pulled off with some grips

 

[etaf]

the plastic at the top has a hexagal shap on top with a metal nut inside is this nut part of the barrell attachemnet so i should end up with a plastic cup (upsidedown) on the top of the tap when i pull it off, will be the nut i can see and the screw thread as part of the barrell,

and then i will be left with a hexaganal hole in the top of the cup, when i pull it off