How to remove this upvc window handle

[PEM03]

How do I remove this type of upvc window handle? There is no visible sign of a screw/allen key.

In the black plastic section hole there looks like metal, but when inserting any type of screwdriver there is nothing to grip on.

 

[plastic_peanut]

I don’t suppose there is a cap over the bracket surrounding the black section? Can this be lifted to expose the fixings?

 

[PEM03]

Black plastic section extends under lock and haven’t found anything to lift so far. I’ll have another go with a Stanley knife/blade, but not optimistic. Logically something must lift.