Cheers Pinenot.
So can I simple replace it with another handle or spindler?
e.g. http://www.amazon.co.uk/uPVC-Window-Handle-Replacement-Handles/dp/B009S5GD0E
The type of window I have allows 2 mode of opening.
1. Tilted, so the top tilts inwards to expose top for ventilation
2. Fully, swings open like a regular window.
The handle had suddenly lose it's power, it become really lose and doesn't operate the opening and closing of the windows...