Kitchen tap-eldiss crusader

elddis crusader

Hi, I seem to have loads of problems with the taps in my 2007 crusader cyclone in fact the kitchen tap has been replaced twice and the bathroom tap once ! Now the 'spray nozzle' has 'dropped out of the kitchen tap (the thingy that makes the water spray out
under pressure instead of (as now) plops out ?

nothing appears broken but try as I might it will not push back in-I have tried putting vasiline around the seal but no joy-any ideas ?