Please Help with my cold tap problem

[Chezzabelle]

Hi, hope you can help, A long time ago now my Cold tap started dripping, I took off the tap head and I couldn't see anything wrong with the tap, (even tho I have no clue about taps )
I replaced the head with a new one and all was OK, then one day the tap stopped working again, by this I mean the head of the tap isn't gripping on, When I turn it there is no friction therefore we cannot turn the tap on, I tried a new head but this time the tap still wouldn't work, Under the tap head cap there is a screw that once unscrewed allows you to remove the tap head, Under that there is a plastic type tube thing and under that is a metal piece that screws on over the top of the tap by 3 little teeny coil type screws....I know this is probably making no sense, but I hope you maybe able to help?
I wondered if a washer perhaps went but then wouldn't the tap be dripping constantly? the head just spins and spins and there is no grip at all.
Please help thanks

 

[seco services]

your right it does go on abit.

have you a pic to give a better idea ?

 

[Chezzabelle]

Okies here are some pictures as I take the tap apart bit by bit and the last picture shows the metal thing I told you about with the teeny screw things...

 

[kevplumb]

who didn't put the brass collar (supplied in the kit) under the washer then

 

[Chezzabelle]

who didn't put the brass collar (supplied in the kit) under the washer then

Im sorry to be thick but please could you explain, im not sure what I left out lol Im in a right muddle

 

[swbjackson]

Looking at the last picture it looks as though the silver coloured bit is held to the brass spindle with grub screws. These have either come loose or worn a channel in the spindle. If they won't tighten it's time for a tap reviver or a new tap.

http://www.screwfix.com/prods/12204...tract?cm_re=SEARCHPROMO-_-TAP REVIVER-_-12204