How to re-attach the tap handle onto the valve stem?

[TonyS]

Dear forum members,

A tap handle with no apparent screw visible anywhere on it has come off the kitchen tap's valve stem and I can't figure out how to put it back.
What is the secret with this model?

Thank you in advance!

 

[snowhead]

The black and the white plastic pieces that are inside the handle should pull out.
The stem of the handle MAY be screwed in, to trap the black and white plastic parts.
There will be a screw on the inner end of the plastic parts that holds them onto the tap valve stem, then the handle would push on and lock on.