Hi I have Plastic Double Glazed Windows the one in the Kitchen wont open I have removed the Handle to Find a Square Similar to the type on door Handles I have Turned the Square That seems to turn two Bolts Locking the Window Either Side (Inside The Window) Trouble is its not working the square will Turn ok but will not release the Bolts all there is is the two screws that holt the Handle in Place and no other Way to get into the Window to release the lock Any Help Will Really Be Apreciated
Lenny